SULTAMICILLIN DRUG REVIEW TAB
Transcription
SULTAMICILLIN DRUG REVIEW TAB
For the use only of a Registered Medical Practitioner or a Hospital or a Laboratory THE M SULTAMICILLIN AL PRODRUG U T U TAB THE SUPER POWER ß-LACTAM… ...SHIELDED WITH SULBACTAM Rs. 15 per tablet & Convenient BID DOSE 202, Ketan Apartment, 233, R.B. Mehta Marg, Ghatkopar (East), Mumbai 400 077 SULTAMICILLIN DRUG REVIEW S U L T A M I C I L L I N S U L T A M I C I L L I N S U L T A M Sultamicillin is the mutual prodrug of sulbactam and ampicillin. Summary Synopsis Sultamicillin is the mutual prodrug of sulbactam and ampicillin. It is the tosylate salt of the double ester of sulbactam plus ampicillin. Sulbactam is a semisynthetic ßlactamase inhibitor which, in combination with ampicillin, extends the antibacterial activity of the latter to include some ßlactamase-producing strains of bacteria that would otherwise be resistant. The combination of sulbactam plus ampicillin for parenteral use has previously been shown to be clinically and bacteriologically effective in a variety of infections. The chemical linkage of sulbactam and ampicillin has now produced an orally effective compound, sultamicillin, with antibacterial activity and clinical efficacy which are similar to those of the parenteral formulation. Sultamicillin has been shown to be clinically effective in noncomparative trials in patients with infections of the respiratory tract, ears, nose and throat, urinary tract, skin and soft tissues, as well as in obstetric and gynaecological infections, and in the treatment of gonorrhoea. In a small number of 1 I C I L L I N controlled trials, sultamicillin has shown comparable clinical efficacy to phenoxymethyl penicillin (penicillin V) and to amoxycillin (alone and in combination with clavulanic acid) in the treatment of paediatric streptococcal pharyngitis and acute otitis media, respectively; to cefaclor in the the treatment of acute otitis media in adults; and to bacampicillin, cloxacillin and flucloxacillin plus ampicillin in skin and soft tissue infections in adults, children and adult diabetic patients, respectively. Sultamicillin was superior in efficacy to bacampicillin in the treamentof chronic respiratory infections, to cefaclor in the treatment of acute otitis media in adults, and to cefadroxil in the treatment of patients with complicated urinary tract infections. Sultamicillin-associated diarrhoea was generally mild and transitory. Dosage and Administration Sultamicillin is available in a tablet dosage form containing 375mg sultamicillin tosylate. The usual adult dose is 375mg administered orally 2 to 3 times daily, taken with an adequate amount of water to avoid lodgement in the oesophagus and potential ulceration. Sultamicillin is contraindicated in patients with history of allergy to any of the penicillins and in patients with infectious mononucleosis, the latter contraindication suggesting caution in its administration to S U L T A M patients with pharyngitis of unknown aetiology. Caution should be exercised in administering sultamicillin to patients receiving allopurinol and to malnourished or debilitated patients in whom symptoms of vitamin K deficiency may occur. Patients with renal dysfunction should receive reduced dosages of sultamicillin in accordance with the usual practice for ampicillin. 1. Antibacterial Activity Sulbactam is a semisynthetic ß-lactamase inhibitor which, when combined with certain antibacterials, extends their activity against bacteria that are normally resistant due to production of inhibitable ß-lactamases. Such a combination is sulbactam plus ampicillin, which has significantly extended the antibacterial activity of ampicillin in clinical practice. The poor oral absorption of sulbactam has made it necessary to administer this combination parenterally. However, a double ester linkage of sulbactam with ampicillin has been developed (fig. 1) to produce a prodrug, sultamicillin, which is readily absorbed orally and hydrolysed by enzymes in the intestinal wall, releasing ampicillin and sulbactam in equimolar proportions. I C I L L I N bacterial enzymes which catalyse the hydrolysis of the ß-lactam ring to inactive derivatives, is an important mechanism of bacterial resistance to ß-lactam antibacterial drugs. ßLactamases may be either chromosomally or R-factor plasmidmediated, and an increasing number are now known to be encoded by transposons, genetic elements capable of transfer among a wide variety of plasmids and between plasmids and chromosomes (Campoli-Richards & Brogden 1987). 1.1 Activity of Sulbactam In Vitro Against ß-lactamases The administration of a compound which is a ß-lactamase inhibitor, in combination with a ß-lactam antibacterial drug of known efficacy and safety, is one approach to the problem of bacterial resistance. The best known of these inhibitors are clavulanic acid and sulbactam, the latter a semisynthetic sulphone derivative of the penicillin nucleus (fig. 1). Both are progressive competitive inhibitors of ß-lactamase in that they compete with the ß-lactam antibacterial drug for the active site on the ß-lactamase enzyme. An irreversible interaction takes place between the enzymes and the inhibitor through the formation of a stable complex, so inactivating the enzyme and destroying the inhibitor. A progressively greater effect is produced with increasing time (Wise 1982). The production of ß-lactamases, In general, sulbactam is effective 2 S U L T A M Synergy in vitro between ampicillin and sulbactam has been defined as a 4-fold or greater decrease in the minimum inhibitory concentration (MIC) against ß-lactamases of Richmond and Sykes types II, III, IV and V, and to much lesser degree against Richmond and Sykes type I. Sulbactam is also effective against certain ß-lactamases from Bacteroides fragilis, although not against the ß-lactamases from B. fragilis from DNA Homology Group II. 1.2 Inhibitory Activity In Vitro Sultamicillin is the tosylate salt of the double ester of ampicillin plus sulbactam in a 1:1 ratio. Mean peak serum ampicillin concentrations achieved following administration of single oral doses of sultamicillin 250mg and 500mg are approximately 60% greater than sulbactam concentrations, thus giving an in vivo serum ratio of approximately 1.6:1 (ampicillin : sulbactam) [Hartley & Wise 1982]. This ratio was occasionally used in assessments of in vitro antibacterial activity (e.g. Eliopoulos et al. 1984), but most studies used ratios of 2:1 or 1:1. Using checkerboard dilution techniques, an in vitro concentrations ratio of 2:1 was reported by Wise et al. (1980) to be 3 I C I L L I N S optimal, although little difference has been noted betwen ratios of 1:4 to 4:1 (Campoli-Richards & Brogden 1987). The discussion of in vitro antibacterial activity will therefore be based on studies that used a 2:1 or a 1:1 ratio. Synergy in vitro between ampicillin and sulbactam has been defined as a 4-fold or greater decrease in the minimum inhibitory concentration (MIC) or minimum bacterial concentration (MBC) of both drugs, or a fractional inhibitory or bactericidal concentration (FIC or FBC) of less than 0.5. Synergy has been demonstrated against ßlactamase-producing strains of B. fragilis from DNA Homology Group I (Appelbaum et al. 1986), against ßlactamase-producing strains of o o S o NH2 C CONH H CH3 CH3 N o S CH3 CH3 o N O C O CH2 O Sultamicillin esterase NH2 C CONH H O S N O Ampicillin O S CH3 CH3 CH3 CH3 N COOH O COOH Sulbactam Haemophilus influenzae, against both penicillin-resistant H. influenzae which do not produce ßlactamase (Campoli-Richards & Brogden 1987). However, rates of U L T A M synergy were low against R-factor plasmid-containing strains of Pseudomonas aeuroginosa, and against P.aeruginosa strains resistant to several other antibacterial drugs (Campoli-Richards & Brogden 1987). The degree of synergy against methicillin resistant S. aureus is probably not clinically significant (see below), and neither sulbactam nor clavulanic acid showed synergy with ampicillin or several other ßlactam antibacterials against ßlactamase-producing isolates of B. fragilis from DNA Homology Group II (Appelbaum et al. 1986). Using a 2:1 ratio of ampicillin plus sulbactam, a susceptibility cut-off point of less than or equal to 8 mg/L (ampicillin) has been recommended (Jones & Barry 1987). In several studies of the in vitro activity of ampicillin plus sulbactam in a 2:1 ratio using an inoculum of 104 to 106 colony-forming units (cfu), MICs of 8 mg/L or less (based on the ampicillin component) were found for S. aureus (including ampicillinresistant strains), Staphylococcus epidermidis, Klebsiella pneumoniae, H. influenzae and various species of Proteus and Bacteroides. MICs several-fold lower than those for ampicillin alone were found for most species of Enterobacteriaceae and methicillin-resistant staphylococci (Campoli-Richards & Brogden 1987) [table I]. However, it has been recommended that all methicillinresistant staphylococci be I C I L L I N considered resistant to ampicillin plus sulbactam even if the MICs indicate susceptibility (Barry & Jones 1988). In vitro MICs of sulbactam plus ampicillin in a 1:1 ratio were also 2to 8-fold lower than for ampicillin alone in a study of 31 clinical isolates of E. coli, Citrobacter koseri and Klebsiella species (Ball et al. 1984). In the latter study, Gram-negative rods were variably susceptible, with synergy demonstrated in over 80% of strains of Proteus and Morganella species but not against Serratia or Pseudomonas species. E.coli, Enterobacter and Klebsiella species showed MICs below 16 mg/L for only 50% of tested strains. Haemophilus ducreyi was also susceptible (MIC90 of 1 mg/L) to ampicillin plus sulbactam in a 1:1 ratio (Jones et al. 1986). Ampicillin plus sulbactam (in a 1:1 ratio) showed the greatest in vitro inhibitory activity against both ampicillin-susceptible and ampicillin resistant strains of H.influenzae and strains of S. epidermidis, in comparison with ampicillin alone, cephalexin, cloxacillin, cefaclor, erythromycin, piperacillin and latamoxef (moxalactam). Against methicillinsusceptible strains of S.aureus the activity of ampicillin plus sulbactam was equal to that of cephalexin (MIC90 = 4 mg/L) and against methicillin-resistant strains of S. 4 S U L T A M aureus the MIC90 of ampicillin plus sulbactam was 16 mg/L (Eliopoulos et al. 1982). Only 1% of 90 cefoxitinresistant strains of anaerobic bacteria [mostly B. fragilis (n=53)] were resistant to the 1:1 ratio of ampicillin plus sulbactam, versus7% for the 2:1 ratio, 16% for clindamycin and 86% for ampicillin; all 90 strains were susceptible to chloramphenicol and metronidazole (Jones & Barry 1988). 2. Pharmacokinetics Sultamicillin was initially developed to improve the oral absorption of the ß-lactamase inhibitor sulbactam. Initial work utilising homogenates of intestines from the rat and dog showed that sultamicillin was hydrolysed within minutes, liberating the active components (Foulds & Brennan 1982). Although the rate of hydrolysis of the prodrug sultamicillin was shown to be dose dependent, and the administration of large doses resulted in incomplete hydrolysis and the release of small quantities of parent compound to the portal circulation, the doses used clinically in human patients were well within the range of quantities which could be completely hydrolysed by enzymes in the intestinal wall (Schach von Wittenau 1984). 2.1 Absorption Concentration and Plasma Initial studies in human volunteers reported by Baltzer et al. (1980) 5 I C I L L I N showed sultamicillin to be rapidly absorbed from the gastrointestinal tract and delivered as ampicillin and sulbactam to the blood. Peak concentrations in plasma occurred in approximately 1 hour and the area under the plasma concentrations versus time curves (AUC) for both ampicillin and sulbactam were similar, indicating a close relationship between the pharmacokinetic handling of the 2 components. Experiments in rats had demonstrated more complete oral absorption of sultamicillin than of either sulbactam or ampicillin when administered as single agents, resulting in AUCs for ampicillin and sulbactam that were 2.5 times greater than those achieved from their administration singly (English et al. 1984). In human volunteers, the increase in peak plasma concentration of ampicillin obtained with sultamicillin in comparison with that obtained with administration of ampicillin alone has been confirmed (Ball et al. 1984; Emmerson et al. 1983; Foulds et al. 1982; Hartley & Wise 1982). In human volunteers approximately 60% of the sulbactam component and 75% of the ampicillin component was absorbed following administration of single 500mg oral doses of sultamicillin, producing mean peak plasma concentrations (Cmax) of 4.4 mg/L and 7.1 mg/L, S U L T A M respectively (Foulds et al. 1982). Slightly higher Cmax values were observed by Hampel et al.(1988), after administration of a single oral dose of sultamicillin: 6.4 mg/L for sulbactam and 11.1 mg/L for ampicillin. Hartley and Wise (1982) reported that mean peak plasma concentrations of ampicillin were approximately 60% greater than sulbactam concentrations after oral doses of sultamicillin 250mg or 500mg, giving an in vivo plasma ratio of approximately 1.6 : 1. These findings are at variance with those of Rogers et al. (1983) who reported mean peak plasma concentrations using an HPCL assay of 9.1 and 8.9 mg/L for ampicillin and sulbactam, respectively, after single 750mg oral doses of sultamicillin. The bioavailability of both drugs was greater than 80% in this study. AUC was roughly proportional to dose in the sultamicillin dose range of 250mg to 750mg. Hampel et al. (1988) found the bioavailability of ampicillin in combination with sulbactam to be about 90%. These investigators also examined the pharmacokinetics of amoxycillin /clavulanic acid and found the bioavailability of amoxycillin to be 72% after a single oral dose of the combination. Foulds et al. (1982) reported no effect of a light meal on the absorption of sultamicillin. While Sakai et al. (1985) found a reduction in the peak plasma concentrations of both I C I L L I N Absorption Following oral administration of 500 mg sultamicillin single dose, 60% of sulbactam and 75% of ampicillin was absorbed producing peak plasma concentration of 4.4 mg/1 of Sulbactam and 7.1 mg/1 of Ampicillin. Thus sultamicillin results in 2.5 times greater concentration of ampicillin and sulbactam than when given alone. This superior pharmacokinetic profile enables twice daily dosage of sultamicillin unlike traditional q.i.d. dosing of ampicillin. sulbactam and ampicillin and a delay of approximately 1 hour in the time to reach the peak plasma concentration when sultamicillin was administered with food, other trials showed little difference in values obtained after administration of sultamicillin in the fasting state or postprandially (Okamoto et al. 1985; Saito et al. 1985a). In all these studies the cumulative urinary excretion rates of sulbactam and ampicillin were unaffected by food. The concomitant administration of an antacid (1g sodium bicarbonate) reduced mean peak plasma concentrations of sulbactam and ampicillin and delayed the 6 S U L T A M I C I L L I N S U L T A M Table II: Some pharmacokinetic values reported for sulbactam (S) and ampicillin (A) following single-dose oral administration of sultamicillin to healthy volunteers several such studies are presented in table III. Reference The tissue or fluid/plasma concentration ratios of both sulbactam and ampicillin varied widely in adult patients with various otorhinolaryngological infections (Mori et al. 1985) as well as in paediatric patients with chronic otitis media (Reilly et al. 1983; Voelker et al. 1985). No difference was found in penetration of drug into middle ear effusions that were serous as opposed to mucoid in nature. Peak sulbactam and ampicillin concentrations also varied from ear to ear in the same patient (Reilly et al. 1983) but were considered sufficient to produce the desired result. Ball et al (1984) Baltzer et al. (1980) Cox et al. (1982) No. of Dose subjects (mg) Cmax (mg/L) tmax (min) (S) (A) (S) 6.1 7.0 10.9 9.3 9.7 11.1 60-90 60-90 6 500 750 475 10 16 250 500 3.6 5.1 2.6 8.7 16 51 (A) 38 750 8.3 11.0 Hampel et al. 10 (1988) 294(S) +440(A) 6.4 11.1 40.9 42.3 Hartley & 250 2.2 3.2 60 40 6 Wise (1982) AUC 0 – ∞ (mg/L * h) t1/2 (h) (S) (S) (A) Vd (L) (A) (S) % recovery in urine (h) (A) (S) (A) 18.6 13.6 75(24) 67(24) 3.9 6.6 4.4 0.70 11.0 0.70 1.24 0.74 50 52 69 72 11.5 14.7 0.69 0.79 49 62 10.9 17.2 0.65 1.33 60(12) 66.9(12) 1.10 1.20 62(8) 62() 1.20 1.00 500 4.0 5.6 60 60 52(8) 80(8) Nakayama et (1985b) 4 750 5.8 7.1 41 41 13.6 17.1 1.02b 1.07b 31.7 39.7 49(8) 57(8) Okada et al al. (1985) 10 375 3.9 5.9 45 42 8.4 12.4 1.03 0.89 27.9 24.4 60(8) 69(8) Rogers et al (1983) 6 750 8.9 9.1 58 55 16.7 17.8 1.11 0.96 Saito et al (1985b) 5 375 2.8 2.4 53 55 5.7 4.3 0.68 0.77 66(8) 55(8) Sawae et al (1985) 4 750 3.6 4.3 30 48 8.0 11.5 1.11 1.16 41(8) 46(8) 58 64 a. Small number of volunteers - number not stated. b. Calculated from Kel Abbreviations : Cmax = maximum (peak) plasma drug concentration; tmax = time to peak concentration; AUC 0 – ∞ = area under plasma concentration-time curve from time zero to infinity; t1/2 = elimination half life ; Vd = volume of distribution 2.2 Distribution incubated at 37ºC for 20 minutes and using the centrifugal ultrafiltration method (Kano et al. 1985). The mean volume of distribution of ampicillin was similar to that of sulbactam in healthy volunteers after administration of single oral doses of sultamicillin (see table II). The in vitro protein binding values of sulbactam and ampicillin in human sera have been reported to be 29.2 and 25.6%, respectively, at a drug concentration of 34 mg/L, Concentrations of sulbactam and ampicillin have been measured in various body tissues and fluids after single-dose administration of sultamicillin to patients. Data from achievement of peak plasma concentrations to 3 hours after administration of a 750mg dose of sultamicillin; again, urinary excretion rates at 6 hours were not affected (Okamoto et al. 1985). 7 Bile concentrations of both sulbactam and ampicillin as measured during T-tube drainage were 2 to 3 mg/L (Yamamoto et al. 1985a). Ampicillin concentration in bile after a 750mg oral dose of sultamicillin was 2.5 to 3 times higher than that obtained after a 500mg oral dose of ampicillin alone (Yura et al. 1985). During cholecystectomy detectable concentrations of both ampicillin and sulbactam were noted in gallbladder and common duct bile as well as in gallbladder wall (Sawada et al. 1985). Purulent exudates from the appendix and wound exudates from postmastectomy sites also contained I C I L L I N Metabolism More than 75% of both Ampicillin & Sulbactam in its active form were recovered in the urine. Urine concentration after 750 mg daily dose were Ampicillin (400mg/1) and Sulbactam (200 mg/1). amounts of sulbactam and ampicillin for a considerable period after administration of sultamicillin (Sakai et al. 1985; Sawada et al. 1985) Transfer of sulbactam and ampicillin to amniotic fluid and cord plasma has been demonstrated in 30 pregnant women (Cho et al. 1985; Takase et al. 1985) and both drugs have been detected in maternal milk samples from 5 patients. Milk concentrations for both sulbactam and ampicillin of 0.04 mg/L were detected at 3 hours after a 375 mg oral dose of sultamicillin, with mean peak milk concentrations at 4 hours of 0.10 and 0.072 mg/L, respectively, and persistence in milk sampled for up to 6 hours after the dose (Takase et al. 1985). 2.3 Metabolism and Elimination Sulbactam has been shown to be excreted primarily in the urine, and metabolism has not been reported in man. Coadministration of ampicillin with sulbactam did not affect the renal elimination (see Campoli8 S U L T A M I C I L L I N Table III Concentrations of sulbactam (S) and ampicillin (A) In various tissues and fluids after single-dose administration of sultamicillin to patients Tissue or fluid/ Reference Tissue/body fluid Type of patient No. of Dose Peak tissue or fluid tmaxa patinents (mg) Sputum Tonsil patients (mg) (h) (mg/kg; mg/L)a ratioa (s) (A) (s) A) 4-6 1.5-4 3.8-17.3 2.1-3.8 1-1.5 11.8-92.3 6.9-16.7 Bronchiectasis 1 Chronic respiratory 4 tract Infection 750 750 0.2-1.3 0.93 0.13-0.52 Otorhinolaryngological infections 750 0.5-0.96 0.24-0.60 7 plasma concentration 6.4-14.9 4 Sinus aspirate Acute sinusitis 3 750 0.57-4.6 0.67-5.2 1.5-2 Bile T-tube drainage 3 1 2 4 750 375 375 1125 1.2-2.8 2.4 0.42-0.7 0.1-1.8C 0.15-2.3e 6.6-7.9 2.74 3.1-4.6 0.44-3.4C 0.01-9.5e 2-5 2.4b 5 1.5-4d 1.5-4d 13 12 1 8 Cholecystectomy 5.7-35.1 5 10 3 Gallbladder wall Cholecystectomy 4 1125 0.3-0.4 0.01-0.59 1.5-4d 8 Appendix wall Cholecystectomy/ appendectomy 3 1125 0.4-0.43 0.05-1.32 1.5-4d 8 Purulent ascites Appendectomy 2 1125 1.04-2.7 1.92-4.45 1.25-3.3d 8 Wound exudate Mastectomy (breast 4 cancer) 750 2.9-3.8 2.2-4.7 4-6 7 Middle ear fluid Chronic otitis media 10 In children 32 50mg/kg 0.3-2.7 50mg/kg 0.16g 0.2-5.2 2 9-43 5->100 6 0.53g 0.5-2f 3.3 9.1 11 Intrapelvic genital organs obstetricc Infection 1 750 2.45h 0.2-1.0l 2.60h 0.1-1.2l 3.5h 2 2 Umbllical cord blood Pregnancy 1 29 750 375 1.6 0.97 1.16 0.76 4-5 1.1.5b 2 9 Amniotic fluid Pregnancy 1 29 750 .75 8.95 0.52 7.5 0.56 10 6.4b 2 9 Maternal milk Postpartum 5 375 0.10 0.072 4 9 f f f f f a - A range of values is given for the patients studied unless otherwise noted. b - tmax sulbactam, tmax ampicillin. c - Common duct bile concentration. d - Samples taken at various times during surgery. e - Gallbladder bile concentration. f - Sample times after the dose, not necessarily representing the peak tissue concentration. g - Mean values for all patients studied. h - Uterine arterial plasma. i - uterine tissues Including endometrium, myometrium, perimetrium, ovary, oviduct, vagina, cervix. areferences: 1 Aoki et al. (1985):2 Choet al. 1985); 3 Jones et al. (1985); 4 Mori et al. (1985;5 Nasu et al. (1985); 6 Reilly et al. (1983); 7 Sakai et al. (1985); 8 Sawada et al. (1985); 9 Takase et al. (1985; 10 Tamita et al. (1985; 11 Voelker et al. (1985); 12 Yamamoto et al. (1985a); 13 Yura et al. (1985). 9 S U L T A M Richards & Brogden 1987). Percentage recovery of sulbactam in urine within 8 hours after administration of single oral doses of sultamicillin (250 to 750 mg) to healthy volunteers has been reported to range from 41 to 66%, and percentage recovery of ampicillin ranged from 46 to 80% (table II). Peak urinary concentrations of sulbactam and ampicillin were 200 mg/L and 400 mg/L, respectively (Foulds et al. 1982), suggesting the potential usefulness of sultamicillin in the treatment of urinary tract infections (see section 3.3). Neither food nor antacid was found to affect the rate or extent of urinary elimination of either sulbactam or ampicillin (Okamoto et al. 1985; Saito et al. 1985a). Urinary excretion of both sulbactam and ampicillin was similar over all sampling times in multiple-dose studies of up to 15 days' duration (Hartley & Wise 1982; Okada et al. 1985b). Since renal clearance of sulbactam exceeds the normal glomerular filtration rate in humans, excretion of sulbactam by tubular secretion is probably of major importance (Foulds 1986.) In studies in which sulbactam was administered parenterally, either alone or with ampicillin, non renal clearance ranged from 1.8 to 3.6 L/h but active secretion of sulbactam was not demonstrated. In a I C I L L I N multiple-dose study of oral sultamicillin administered to 4 human volunteers (375mg twice daily for 15 days) sulbactam was detected in only 2 of 12 faecal samples, one at day 9 and the other at day 16 of the study (Okada et al. 1985b). 2.3.1 Elimination Half-Life The mean elimination half-life of sulbactam ranged from 0.65 to 1.20 hours, and that of ampicillin ranged from 0.74 to 1.33 hours, in studies of oral sultamicillin administered to healthy volunteers (table II). These values are not different from those reported for either drug administered alone. 2.1 Influence of Disease and Age on Pharmacokinetics 2.4.1 Renal Dysfunction Patients with renal failure who were administered parenteral doses of sulbactam plus ampicillin had increased plasma concentrations and delayed excretion of both drugs. Single oral doses of sultamicillin (750mg) administered to 4 groups of 5 patients with varying degress of renal impairment produced similar results (Boelaert et al. 1983) [table IV]. Additionally, in a clinical trial of oral sultamicillin in 30 patients (mean age 62 years) with acute exacerbations of chronic bronchitis, increases in mean AUCs and prolonged half-lives for both sulbactam and ampicillin were 10 S U L T A M I C I L L I N Table IV Pharmacokinetic values reported for sulbactam (S) and ampicillin (A) following single-dose oral administration of sultamicillin (750mg) to 4 groups of 5 patients with varying degrees of renal dysfunction (after Boelaert et al. 1983) Group 1 2 3 4 Creatinine clearance (ml/min) Cmax (mg/L) AUC 0 – ∞ (mg/L * h) t1/2 (h) 24-hour urinary recovery (%) (S) (A) (S) (A) (S) (A) (S) (A) 80-144 25-69 6-12 <5 5.7 8.2 7.6 8.5 8.6 12.0 14.0 16.0 14 38 111 24 63 224 0.9 2.3 8.1 2.4* 1.3 2.6 8.5 3.3* 55 30 19 66 40 25 a During haemodialysis. b Calculated from Ket. Abbreviations : Cmax = maximum (peak) plasma drug concentration; AUC 0 – ∞ = area under plasma concentration-time curve from time zero to infinity; t1/2 = elimination half life ; found in comparison with healthy volunteers; these findings were attributed to decreased renal clearance since 10 of the 30 patients had elevated plasma creatinine concentrations (Davies et al. 1984). Since both sulbactam and ampicillin appear to be affected similarly in patients with impaired renal function (Boelaert et al. 1983) dosage alterations for sultamicillin may prove similar to those for ampicillin alone. 2.4.2 Hepatic Dysfunction Little information is available on the use of sultamicillin in patients with hepatic dysfunction. Studies in liverdamaged rats showed reduced serum concentrations and higher urinary recoveries of both sulbactam and ampicillin (Kano et al. 1985). In 2 patients with obstructive jaundice, 1 from cancer of the bile duct and the other from liver cirrhosis, who were administered single doses of sultamicillin 375mg, absorption and biliary excretion of ampicillin were 11 slower than those of sulbactam, and urinary recovery in 12 hours was 44.4% and 35.7%, respectively (Aoki et al. 1985). 2.4.3. Paediatric Patients In 20 infants and children (8 to 69 months of age, mean 27 months) administration of sultamicillin as a suspension containing 25 mg/kg ampicillin and 17.5 mg/kg sulbactam resulted in peak plasma concentrations of ampicillin which were greater at 20, 40, 60 and 90 minutes after the dose than were the concentrations when ampicillin 25 mg/kg was administered as a single agent. The AUC for ampicillin was 39% greater when administered as sultamicillin than was the AUC for ampicillin alone. Coadministration of sultamicillin with milk increased the plasma concentration but not the AUCs of sulbactam and ampicillin (Ginsburg et al. 1985). The pharmacokinetic disposition of ampicillin was similar to that of sulbactam in these studies and did S U L T A M not differ greatly from values found in healthy adult volunteers. 2.4.4 Geriatric Pateints Some pharmacokinetic values in elderly patients (number of patients not specified; mean age 81.6 years) administered a single dose of sultamicillin 500mg were altered slightly in comparison with values reported for younger patients (Lode et al. 1989). Ampicillin and sulbactam AUC values were 47.0 and 20.3 mg/L * h, respectively, Cmaxs were 11.4 and 5.5 mg/L, respectively, and t1/2 ≤ s were 2.33 and 2.57 hours, respectively. This indicates that enhanced absorption and delayed elimination of sultamicillin are likely to occur to some extent in elderly patients. 3. Therapeutic Trials The therapeutic efficacy of sultamicillin has been demonstrated in a number of non-comparative therapeutic trials in patients with a variety of infections. These include respiratory tract infections, otorhinolaryngological infections, urinary tract infections, gonorrhoea, skin and soft tissue infections, obstetric and gynaecological infections, osteomyelitis/septic arthritis, and infections arising from ophthalmological and oral surgery. The overall clinical efficacy sultamicillin, defined as percentage of patients having excellent or good response, of the an as I C I L L I N compiled by the manufacturer from the non-comparative trials, was 89.8% of 2,187 clinically assessable patients. The bacteriological eradication rate assessed in a world wide survey including data obtained in the US, Europe and Japan from non-comparative and comparative trials was 86.8% of 2,947 strains (Pitts et al. 1989). In addition, comparative studies including 2,159 patients treated with sultamicillin have assessed the therapeutic efficacy of sultamicillin in comparison with alternative antibacterial drugs in the treatment of various infections. Overall clinical efficacy was 84.9% for pneumonia, lung abscess and various chronic respiratory tract infections, 92.4% for acute streptococcal pharyngitis, tonsillitis and acute otitis media, 86.3% for complicated urinary tract infections and gonorrhoea, and 89.4% for skin and soft tissue infections (Pitts et al. 1989). 3.1 Respiratory Tract Infections 3.1.1 Non-Comparative Results The clinical efficacy of sultamicillin in various infections of the lower respiratory tract has been reported in several non-comparative clinical trials Patient gropus were small (maximum 33) and the types of infection being treated were varied, including pneumonia, acute and chronic bronchitis, bronchiectasis, diffuse panbronchiolitis, emphy12 S U L T A M Respiratory Tract Infections Sultamicillin gave excellent results in lower respiratory infection including pneumonia, acute and chronic bronchitis, bronchiectasis, infected emphysema and lung abscess. The most causative organisms were H. influenza, Strep pneumoniae, B. catarrhalis, and Staph aureus. sema with infection, infected pulmonary fibrosis, and lung abscess. The most common causative organisms were Haemophilus influenzae, Streptococcus pneumoniae, Staphylococcus aureus and Pseudomonas aeruginosa. Overall clinical efficacy, expressed as the percentage of patients having a good to excellent response at the end of treatment, ranged from 83 to 100%. The wide variation in response rate is not unexpected, given the variety of infections, the number of different causative organisms isolated, the varying dosage regimens (total daily dosages of 750 to 2250mg for treatment durations of 2 to 43 days) and the coexistence of underlying disease in many patients. (Only 2 of the non-comparative clinical trials were restricted to a single type of infection. Pressler et al. (1986) investigated the efficacy of 13 I C I L L I N S U L T A M oral sultamicillin 25 mg/kg (maximum 750mg) 12-hourly for 14 days in 8 children with cystic fibrosis and 10 children with other chronic obstructive pulmonary disease suffering from chronic obstructive pulmonary disease suffering from chronic or recurrent H. influenzae infections. At the end of treatment the original organism had been eradicated in 65% of patients, but in 29% of patients other H. influenzae biotypes were present. A follow-up 1 month later, 8 of 15 patients had negative cultures). Davies et al. (1984) studied a total of 30 adult patients admitted to hospital with acute purulent exacerbations of preexisting chronic bronchitis. Patients received oral sultamicillin 750mg (16 patients) or 1000mg (14 patients) twice daily for 10 days. An excellent or good clinical response was noted in 62.5 and 85.7% of patients, respectively, at the end of treatment. The major organisms isolated, either singly or in combination, in 25 of 30 pretreatment sputum cultures were H. influenzae, S. pneumoniae and Branhamella catarrhalis. At the end of treatment 8 patients still had positive sputum cultures, but all ßlactamase-producing strains had been eliminated. and throat has been reported in several small (n < 41) noncomparative clinical trials. The most common infection was acute otitis media, followed by acute exacerbations of chronic otitis media, acute tonsillitis, acute and chronic sinusitis and pharyngitis. The most common infecting organisms were S. aureus, S. pneumoniae, other streptococci, H. influenzae, Staphylococcus epidermidis, B. catarrhalis and P. aeruginosa. Daily sultamicillin dosages ranged from 750 to 2250mg, with a paediatric total daily dosage of 50 mg/kg; treatment duration ranged from 3 to 21 days. The percentage of patients having a good to excellent clinical response with sultamicillin ranged from 75 to 100%, (Kawakami et al. 1985; Onishi et al. 1985; Sakamoto et al. 1985b). 3.2 Otorhinolaryngological Infections Two large double-blind studies assessed the comparative efficacy of thrice daily administration of sultamicillin 375mg and cefaclor 250mg in adult patients with otorhinolaryngological infections. In 3.2.1 Non-Comparative Results The clinical efficacy of sultamicillin in various infections of the ear, nose The efficacy of sultamicillin has been assessed in comparative clinical trials of streptococcal pharyngitis (Aronoff et al. 1984) and acute otitis media (Khan et al. 1988; Sait et al. 1986) in children, and of tonsillitis (Baba et al. 1985), pharyngitis and peritonsillar abscesses (Federspil et al. 1989) and acute otitis media (Kawamura et al. 1985) in adults. I C I L L I N Ear, Nose and Throat Infections Sultamicillin has been found of high efficacy in acute and chronic cases of otitis media, tonsillitis, sinusitis, and pharyngitis. The most common infecting organisms were S.pneumoniae, H.influenzae, B.catarrhalis, and Staph aureus. both studies, patients groups were no statistically different as to demographic, clinical or bacteriological parameters, including the incidence of ß-lactamase-producing pathogens. In patients with lacunar tonsillitis, baba et al. (1985) reported clinical efficacy rates of 91.9% for sultamicillin (91 of 99 patients) and 91.1% for cefaclor (82 of 90 patients), with bacteriological eradication rates of 98.9 and 97.7%, respectively. While in this study neither overall clinical nor bacteriological efficacy differed to a statistically significant extent between treatment groups, in the subgroup of patients with severe symptoms, excellent clinical efficacy occurred in 11 of 14 sultamicillintreated patients (78.6%) versus only 2 of 8 cefaclor-treated patients (25.0%) [p < 0.05]. There were no statistically significant differences between treatment groups in clinical efficacy against ß-lactamaseproducing S. aureus (80% and 75% 14 S U L T A M Urinary Tract Infections Sultamicillin shows excellent efficacy in upper urinary tract and lower urinary tract infections including acute cystitis, acute or chronic prostatitis and UTI acquired post-surgically. The most common pathogens isolated were E.coli, Proteus spp, Streptococcus faecalis, Staph saphrophyticus and Serratia spp. for sultamicillin and cefaclor, respectively) or against other ßlactamase-producing bacteria (73 and 70%, respectively). In patients with purulent otitis media, Kawamura et al. (1985) reported an excellent or good clinical response in 67.6% (75/111) of sultamicillintreated patients but only 52.3% (58/111) of cefaclor-treated patients (p < 0.05). In another study, Sait et al. (1986) compared the efficacy of sultamicillin administered twice daily (n = 30) with that of sultamicillin (n = 27) or amoxycillin (n = 29) 3 times daily in 3 parallel groups of children with acute otitis media (dosages and duration of therapy were not stated). Clinical efficacy rates at the end of the study were 92.8, 91.3 and 100%, 15 I C I L L I N respectively, with both children initially infected by ampicillinresistant H.influenzae being cured by sultamicillin. However, at a 4week follow-up 41.7% of 24 children who had taken amoxycillin had recurrent otitis media with effusion as opposed to 4.3% of 46 children who had taken sultamicillin (p = 0.002). Total percentage relapses fo the 3 groups were 18.5, 26.3 and 26.1%, respectively (no statistical values were reported). 3.3 Urinary Tract Infections 3.3.1 Non-Comparative Results The clinical efficacy of sultamicillin has been reported in several noncomparative trials in patients with acute uncomplicated cystitis and complicated urinary tract infections associated with underlying urinary tract diseases. A total of 274 patients with acute uncomplicated cystitis were treated with sultamicillin in total daily dosages of 750 to 2250mg for 3 to 14 days in several clinical trials. Overall clinical efficacy, defined as excellent or moderate improvement in pain on micturition, pyuria and bacteriuria, occured in 80 to 100% of patients, while bacteriological efficacy (percentage of strains eradicated) ranged from 66.7 to 100%. The most common infecting bacteria were E. coli and S. epidermidis. Although 3 ß-lactamase-producing strains of E.coli were resistant to sultamicillin S U L T A M (MIC of 50 to 200 mg/L) in the study of Suzuki et al. (1985b), clinical improvement in the patients harbouring these strains was moderate to excellent. Kawada (1989) noted that the eradication rate of 84.2% for high ß-lactamaseproducing organisms, but this difference was not statistically significant. 381 patients with different types of complicated urinary tract infections were treated with sultamicillin in various clinical studies. Total daily dosages ranged from 750 to 2250mg daily for 2 to 28 days. Overall clinical efficacy ranged from 77% in a group of geriatric patients (Nakauchi 1985) to 89%, and bacteriological efficacy (percentage of strains eradicated ) ranged from 66.7 to 93.8%. When patients were subgrouped according to type of infection (e.g. postprostatectomy, upper urinary tract or lower urinary tract), clinical efficacy was widely variable among studies. However, the presence of an indwelling catheter resulted in poorer clinical outcome in most studies. The most common pathogens isolated were E. coli, Streptococcus faecalis, Proteus species, P. aeruginosa, S. epidermidis, Serratia marcescens and K. pneumoniae. Bacteria which produced high levels as opposed to little or no ß-lactamase were more susceptible to sultamicillin in 1 study (Mizuno et al. 1985) with bacteriological eradication of 71.5% I C I L L I N of the high ß-lactamase-producing strains of bacteria to be susceptible to sultamicillin (MICs of 1.56 to 12.5 mg/L) with the exception of a strain of Pseudomonas maltophilia (MIC 400 mg/L), in which case clinical outcome was poor. The division of a total daily dosage of sultamicillin 1500mg into 2 equal doses given 12-hourly or 3 equal doses given 8-hourly, each for 7 days, resulted in similar bacteriological cure rates (87.5 and 89%, respectively) in 2 groups of 20 patients with infections due to ampicillin-resistant organisms (Ball et al. 1984). Other small groups of patients for whom efficacy data is available from non-comparative trials include those with urinary tract infetions acquired post-surgically (10 patients, overall efficacy of 6%) [Nakayama et al. 1985; Suzuki et al. 1985a; Yamamoto et al. 1985a] and those with nonsurgical acute or chronic prostatitis (6 patients, overall efficacy 83%) [Nakauchi 1985; Shimada et al. 1985; Tominaga et al. 1985]. 3.5 Skin and Soft Tissue Infections 3.5.1 Non-Comparative Results The efficacy of sultamicillin administered in total daily dosages of 750 to 2250mg for 3 to 28 days has been assessed in several noncomparative trials in patients with various surgical skin and soft tissue infections, including infected 16 S U L T A M Skin & Soft tissue Infections Sultamicillin shows excellent efficacy in various skin and soft tissue infection like infected atheromas, furuncles, abscesses, carbuncles, cellulitis including post surgical Skin and Soft tissue infections. atheromas, furuncles and abscesses and in patients with similar types of non-surgical skin infections. Clinical efficacy rates ranged from 70.2 to 86.7% in surgical infections and from 75 to 100% in those of non-surgical origin. Bacterial eradication in surgical infections ranged from 63 to 80.6% of initially infecting organisms, including 1 patient each infected with B. fragilis (Suzuki et al. 1985a) and Bacteroides species (Sakai et al. 1985). In 1 of the above studies, 78.9% of patients infected with organism producing high levels of ß-lactamase had a good to excellent clinical response, as opposed to 60% of patients infected with low-ß-lactamase-producing organisms and 73.7% of patients with non-ß-lactamase-producing organisms (Yura et al. 1985). Sakai et al. (1985) found no relation between clinical effect and total daily dosage. 3.5.2 Comparative Results Adult diabetic patients with various soft tissue infections were 17 I C I L L I N randomised to receive either sulbactam plus ampicillin or flucloxacillin plus ampicillin parenterally for 3 to 18 days, followed by oral sultamicillin (total daily dosage 1.5g for 2 to 68 days) or oral flucloxacillin plus ampicillin in varying dosages for 4 to 47 days (Chiodini et al. 1985). Seven of 12 patients in the sulbactam plus ampicillin and sultamicillin group, and 9 to 13 patients in the flucloxacillin plus ampicillin group, were cured. Both groups showed a satisfactory response to therapy and only 1 strain of E. coli was resistant to sultamicillin. There were no adverse effects of either treatment on diabetic control. A large double-blind study compared the efficacy of 3 times daily administration of sultamicillin 375mg and of bacampicillin 250mg for 7 days to adult patients with furuncle, furunculosis, carbuncle, cellulitis or other skin and soft tissue infections (Nohara et al. 1985). Patient groups did not differ to a statistically significant extent as to demographic, clinical or bacteriological parameters, including the incidence of ßlactamase-producing pathogens. The 2 drug treatments did not statistically differ from each other: excellent to good clinical response occurred in 81 of 99 sultamicillin treatment patients (81.8%) and 77 of 105 bacampicillin-treated patients (74.3%), while bacteriological S U L T A M eradication rates were identical (82%). 3.6 Obstetric and Gynaecological Infections The use of sultamicillin in the treatment of obstetric and gynaecological infections in 4 noncomparative clinical trials resulted in an overall good to excellent clinical response in 49 of 50 patients studied and a poor response in only 1 patient with puerperal mastitis (Cho et al. 1985; Matsuda et al. 1985; Takase et al. 1985; Yamamoto et al. 1985b). Types of infection included endometriosis, adnexitis, vulval infections, puerperal mastitis, abscess, pelvic peritonitis and cystitis or pyelonephritis associated with cervical or ovarian cancer. The infections were due to a variety of organisms. The bacteriological eradication rate was 82% overall. No controlled trials of sultamicillin in comparison with other drugs for the treatment of obstetric and gynaecological infections have been reported to date. 4. Drug Interactions Probenecid delays the renal secretion of sulbactam and ampicillin and prolongs the serum half lives of both (section 2.3). This interaction forms the basis for the combined use of probenecid with sultamicillin in the treatment of gonorrhoea (section 3.4). The concurrent use of sultamicillin I C I L L I N Gynec & Obs Infections Sultamicillin gives excellent efficacy in obstetric and gynaecological infections including endometriosis, adnexitis, vulva infections, abscess, pelvic peritonitis, cystitis and pyelonephritis associated with cervical or ovarian cancer. with other antibacterial drugs known to cause diarrhoea may increase the severity of symptoms, as found by Pressler et al. (1986) in 4 patients with severe diarrhoea associated with concomitant treatment with sultamicillin and fusidic acid. Concurrent administration of allorpurinol and ampicillin increases the incidence of rashes in patients receiving both drugs compared to that occuring with ampicillin alone. It is not known whether this is due to allopurinol or to the hyperuricaemia present in these patients (Boston Collaborative Drug Surveillance Program 1972). This type of interaction with sultamicillin and allopurinol has not been reported. 5. Dosage and Administration Sultamicillin is currently available in tablet formulation containing 375mg sultamicillin as the tosylate salt. The 18 S U L T A M Dosage The usual adults dose is Sultamicillin 375 mg bid is most cases and severe infections 375 mg tid or 750 mg bid is advocated. usual adult dosage is 375mg administered orally 2 to 3 times daily. Tablets should be taken usually with an adequate amount of water. A dosage adjustment may be made depending on the patient's age and/or symptoms. Sultamicillin is contraindicated in patients with a history of an allergic reaction of any of the penicillins. Sultamicillin is also contraindicated in patients with infectious mononucleosis, due to a high incidence of skin rash in response to ampicillin in these patients; the latter contraindication suggests caution in the administration of sultamicillin to patients with pharyngitis of unidentified aetiology. In patients with renal dysfunction the elimination of both sulbactam and ampicillin may be impaired, resulting in increased serum concentrations and prolonged halflives of both drugs (section 2.4.1). The dosage of sultamicillin should probably be decreased in accordance with the usual practice for ampicillin, and caution should be exercised when administering the drug to patients with severe renal disease. 19 I C I L L I N In patients who are malnourished or debilitated, or are receiving parenteral or enternal nutrition, the manufacturer recommends that caution should be exercised as symptoms of vitamin K deficiency (hypoprothrombinaemia and/or haemmorhagic tendency) may appear (see section 4.2). Dosage The usual adults dose is Sultamicillin 375 mg bid is most cases and severe infections 375 mg tid or 750 mg bid is advocated. References Allan JD, Moellering Jr RC, Antimicrobial combinations in the therapy of infections due to Gramnegative bacilli. American Journal of Medicine 78 (Suppl. 2A): 65-75, 1985a Allan JD, Moellering Jr RC, Management of infections caused by Gram-negative bacilli; the role of antimicrobial combinations, Reviews of Infectious Diseases 7 (Suppl. 4): S559-S71, 1985b Aoki N, Sekine O, Usuda Y, Tuasa Y, Shimizu T, et al. Clinical study of sultamicillin. Chemotherapy (Tokyo) 33 (Suppl, 2): 203-208, 1985 Aonuma S. Sasaki R, Onuma K, Watanabe A, Sasaki M, et al. Sultamicillin; antimicrobial activity and clinical investigation of respiratory tract infections. Chemotherapy (Tokyo) 33 (Suppl, 2): S U L T A M 185-189, 1985 Appelbaum PC, Jacobs MR, Spangler SK, Yamabe S. Comparative activity of ß-lactams against ß-lactamase-producing anaerobes. Antimicrobial Agents and Chemotherapy 30: 789-791, 1986 Aronoff SC, Klinger JD, O'Brien CA, Jaffe AC, Blumer JL. A double-blind comparative study of sultamicillin and potassium penicillin V in the treatment of childhood streptococcal pharyngitis. Journal of Antimicrobial Agents and Chemotherapy 14:261-265, 1984 Aronoff SC, Scoles PV, Makley JT, Jacobs MR, Blumer JL, et al. Efficacy and safety of sequential treatment with parenteral sulbactam/ampicillin and oral sultamicillin for skeletal infections in children. Reviews of Infectious Diseases 8 (Suppl. 5): S639-S643, 1986 Atia WA, Emmerson AM, Holmes D. Sultamicillin in the treatment of gonorrhoea caused by penicillin sensitive and penicillinase producing strains of Neisseria gonorrhoeae. British Hournal of Venereal Diseases 59: 293-297, 1983 Auckenthaler R, Von Graevenitz A, Michea-Hamzehpour M, Wust J, Zollinger-Iten J. Effect of sulbactamampicillin on ampicillin-resistant bacteria in two Swiss hospitals. Current Therapeutic Research 40: 1078-1083, 1986 I C I L L I N Baba S. Kinoshita H, Mori Y, Suzuki K, Sawamura S. et al. Evaluation of sultamicillin in acute lacunar tonsillitis: a comparative double blind study with cefaclor, Jibi to Rinsho 31: 1047-1065, 1985 Ball AP, Fox C, Ghosh D. Sultamicillin (CP-49,952): evaluation of two dosage schedules in urinary infection. Journal of Anti-microbial Chemotherapy 14: 395-401, 1984 Baltzer B, Binderup E, Von Daehne W, Godtfredsen WO Hansen K, et al. Mutual pro-durgs of ß-lactam antibiotics and ß-lactamse inhibitors. Journal of Antibiotics 33: 1183-1192, 1980 Barry AL, Jones RN. Proposed changes in interpretive criteria and potency of ampicillin and ampicillinsulbactam disks for susceptibility tests. Journal of Clinical Microbiology 26: 750-754, 1988 Boelaert J, Robbens E, Daneels R, Schurgers M, Lambert AM, et al. Pharmacokinetics of sulbactam and ampicillin in patients with renal impairment after a single oral dose of sultamicillin. Abstract No. 842. Program Abstracts, 23rd Interscience Conference on Antimicrobial Agents and Chemotherapy, Nevada 24-26 October, 1983 Boston Collaborative Drug Surveillance Program. Excess of ampicillin rashes associated with allopurinol or hyperuricemia. New England Journal of Medicine 286: 20 S U L T A M 505, 1972 Campoli-Richards DM, Brogden RN, Sulbactam/ampicillin: a review of its antibacterial activity, pharmacokinetic properties, and therapeutic use. Drugs 33: 577-609, 1987 Chiodini PL, Toop MJ, OdugbesanO, Gilbert J, Farrell ID, et al, Sulbactam/ampicillin: effects on glucose metabolism in diabetics with soft tissue infection. Journal of Antimicrobial Chemotherapy 16: 643-647, 1985 Cho N, Miyashita H, Ichikawa K, Hosokowa T, Yokoo Y, et al. Fundamental and clinical evaluations of sultamicillin in obstetrical and gynaecological field. Chemotherapy (Tokyo) 33 (Suppl. 2): 714-729, 1985 Colby SD, Miller LK, Crider SR, Kerbs SBJ, Harrison WO, et al. Oral sultamicillin vs parenteral spectinomycin in the treatment of gonococcal urethritis due to penicillinase-producing Neisseria gonorrhoeae (PPNG). Abstract No. 474, Program Abstract. 23rd Interscience Conference on Antimicrobial Agents and Chemotherapy, Nevada, 24-26 October, 1986 Cox DA, Less LJ, De Palol J, Wharfe SMW, The bioavailability of sulbactam and ampicillin and dose response following oral administration of sultamicillin in 21 I C I L L I N dises of 250, 500 and 750mg. Abstract No. 518, Program Abstracts, 22nd Interscience Conference on Antimicrobial Agents and Chemotherapy, Miami Beach, 4-6 October, 1982. Davies BI, Maesen FPV, Aminopenicillins and superinfection by Gram-negative rods. Journal of Antimicrobial Chemotherapy 17: 543-544, 1986 Davies BI, Maesen FPV, van Noord JA, Clinical, bacteriological and pharmacokinetic results from an open trial of sultamicillin in patients with acute exacerbations of chronic bronchitis. Journal of Antimicrobial Chemotherapy 13: 161-170, 1984 Eliopoulos GM, Gardella A, Moellering Jr RC, In vitro activity of sultamicillin (SA) in comparison with other oral antibiotics Abstract No. 511, Program Abstracts, 22nd Interscience Conference on Antimicrobial Agents and Chemotherapy, Miami Beach, 4-6 October, 1982 Emmerson Am, Cox DA, Less LJ. Pharmacokinetics of sulbactam and ampicillin following oral administration of sultamicillin with probenecid. European Journal of Clinical Microbiology 2: 340-344, 1983 English AR, Cimochowski CR, Failla J, Lynch JE Activity of sultamicillin against animal model infections. Abstract No. 516, Program Asbtracts, S U L T A M 22nd Interscience Conference on Antimicrobial Agents and Chemotherapy, Miami Beach, 4-6 October, 1982 English AR, Girard D, Haskell SL, Pharmacokinetics of sultamicillin in mice, rats, and dogs. Antimicrobial Agents and Chemotherapy 25: 599602, 1984 Esposito E, Galance D, Barba D, Giusti G. Valutazione clinicadella sultamicillina in confronto alla amoxicillina ne trattamento delle infezioni urinarie, respiratorie ed ORL. Farmaci & Terapia d: 269-275, 1987 Farthing C, Thin RN, Smith S. Phillips I. Two regimens of sultamicillin in treating umcomplicated gonorrhoea. Genitourinary Medicine 61: 44-47, 1985 Federspil P, Grunbacher G, Lejdebron L, Meder B, Mikaelsen T, et al, Sultamicillin versus amoxicillin in the treatment of tonsillitis. Acta Pathologica Microbiologica et Immunologica Scandinavica (Suppl.), in press, 1989 Foulds G. Pharmacokinetics of sulbactam/ampicillin in humans: a review. Reviews of Infections Diseases 8 (Suppl. 5): 503-511, 1986 Foulds G, Brennan DR. Some aspects of the absorption of sultamicillin. Abstract No. 55, Program Abstracts, 22nd Interscience Conference on Antimicrobial Agents and I C I L L I N Chemotherapy, Miami Beach, 4-6 October, 1982 Foulds G. Stankewich JP, Knirsch AK. Weidler DJ. The pharmacokinetics of sultamicillin in man. Abstract No. 519, Program Abstracts. 22nd Interscience Conference on Antimicrobial Agents and Chemotherapy, Miami Beach, 46 October, 1982 Fuglesang JE, Bergen T. Antibacterial activity and kill kinetics of ampicillin/sulbactam (CP-45899) combinations against Escherichia coli and Klebsiella aerogenes. Infection 12: 46-50, 1984 Fujimaki Y, Kawamura S, Sugita R, Deguchi K, Effect of sultamicillin in otorhinolaryngological infections. Chemotherapy (Tokyo) 33 (Suppl. 2): 626-634, 1985 Ginsburg CM, McCracken Jr GH, Olsen K, Petruska M. Pharmacokinetics and bactericidal activity of sultamicillin in infants and children. Journal of Antimicrobial Chemotherapy 15: 345-351, 1985 Girard AE, Murphy KT Herbert CJ, Sawyer PS. In vitro and in vivo synergistic activity of sulbactam with ß-lactams vs Bacteroides fragilis. Presented at the 23rd Interscience Conference on Antimicrobial Agents and Chemotherapy, Las Vegas, 24-26 October, 1983 Goldfarb J, Aronoff SC, Jaffe Am 22 S U L T A M I C I L L I N Reed MD, Blumer JL, Sultamicillin in the treatment of superficial skin and soft tissue infections in children. Antimicrobial Agents and Chemotherapy 31: 663-664, 1987 Ikeda M, Yamamoto Y, Arata J, Fundamental and clinical studies on sultamicillin in the field of dermatology. Chemotherapy (Tokyo) 33 (Suppl. 2): 770-773, 1985 Goto S, Ogawa M, Kaneko Y, Miyazaki S, Tsuji A, et al. Bacteriological studies on sultamicillin. Chemotherapy (Tokyo) 33 (Suppl. 2): 37-53, 1985 Ito T. Clinical evaluations of sultamicillin in respiratory tract infection. Chemotherapy (Tokyo) 33 (Suppl. 2): 190-193, 1985 Hampel B, Lode H, Bruckner G, KoeppeP. Comparative pharmacokinetics of sulbactam/ampicillin and clavulanic acid/amoxycillin in human volunteers. Drugs 35 (Suppl. 7): 2933, 1988 Hartley S, Wise R. A three-way crossover study to compare the pharmacokinetics and acceptability of sultamicillin at two dose levels with that of ampicillin. Journal of Antimicrobial Chemotherapy 10: 4955, 1982 Japan UTI Committee. Criteria for evaluation of clinical efficacy of antimicrobial agents on urinary tract infection, 2nd ed., Department of Urology, Gifu University School of Medicine, 1981 Jones BM, Hafiz S, Duerden BI. Susceptibility of Haemophilus decreyi to ampicillin and sulbactam in vitro. Antimicrobial Agents and Chemotherapy 29: 1110-1112, 1986 Hatano H. Studies on sultamicillin in the field of ohthalmology, Chemotherapy (Tokyo) 33 (Suppl. 2): 804-809, 1985 Jones RN, Barry AL. Optimal dilution susceptibility testing conditions, recommendations for MIC interpretation, and quality control guidelines for the ampicillinsulbactam combination. Journal of Clinical Microbiology 25: 1920-1925, 1987 Hayase M, Ohya N. Clinical study on sultamicillin in the treatment of respiratory tract infection/Chemotherapy (Tokyo) 33 (Suppl. 2): 194-198, 1985 Jones RN, Barry AL. In-vitro activity of ampicillin/sulbactam against cefoxitin-resistant anaerobic bacteria. Journal of Anti-microbial Chemotherapy 21: 135-137, 1988 Hirose T, Kumoto Y, Sakai S, Nishijima N, Microbiological and clinical studies on sultamicillin. Chemotherapy (Tokyo) 33 (Suppl. 2: 462-487, 1985 Jones S, Yu VL, Johnson JT, Wagner RL, Kim HC. Pharmacokinetic and therapeutic trial of sultamicillin in acute sinusitis Antimicrobial Agents and Chemotherapy 28: 832-833, 1985 23 S U L T A M Kaleida PH, Bluestone CD, Blatter MM, Reisinger KS, Wucher FP, et al. Sultamicillin (ampicillin-sulbactam) in the treatment of acute otitis media in children. Pediatric Infectious Disease 5: 33-38, 1986 Kamidono S. Fujii A, Arakawa S. Harada M, Kataoka N, et al. Fundamental and clinical studies on sultamicillin in the urological field. Chemotherapy (Tokyo) 33 (Suppl. 2): 581-595. 1985 Kano H, Takei H, Omori K, Murakami M, Shimooka K, et al. The absorption, distribution and excretion of sultamicillin tosilate in experimental animals. Chemotherapy (Tokyo) 33 (Suppl. 2): 128-153, 1985 Kato M, Kato J, Suzuki K, Yoshitomo K, Kishimoto A, et al. Clinical evaluation of sultamicillin in the field of respiratory tract infections. Chemotherapy (Tokyo) 33 (Suppl. 2): 276-280, 1985 Kawada Y. Sultamicillin in the treatment of urinary trat infections. Acta Pathologica Microbiologica et Immunologica Scandinavica (Suppl.) in press, 1989 I C I L L I N Kawada Y, Nishiura T, Ban Y, Kumamoto Y, Sakai S, et al. Comparative studies of sultamicillin and cefadroxil in complicated urinary tract infections. (Chemotherapy) (Tokyo) 33 (Suppl. 2): 685-707, 1985 Kawakami S, Yoneda T, Okada S, Ogura Y, Clinical studies of sultamicillin in teh otorhinolaryngeal field. Chemotherapy (Tokyo) 33 (Suppl. 2): 796-803,1985 Kawamura S, Sugita R, Itabashi T, Watanabe H, Fujimaki Y, et al. Evaluation of sultamicillin in acute suppurative otitis media and acute exacerbation of chronic otitis media: a comparative double blind study with cefaclor. Jibi to Rinsho 31: 10241046, 1985 Kawano H, Kuramoto H, Kumazawa J, Masaki Z, Nakamuta S. et al. Clinical study of sultamiillin in the treatment of urinary tract infections. Chemotherapy (Tokyo) Kawasaki K, Niimi H, Matsumura 24 For the use only of a Registered Medical Practitioner or a Hospital or a Laboratory MUTUAL PRODRUG CONCEPT FUNDAMENTALS AND APPLICATIONS Indian J Pharm Sci 2006;68:286-294 PRODRUG CONCEPT • Many drugs have various shortcomings. For e.g. poor bioavailability (Ampicillin), incomplete absorption (epinephrine), nonspecificity (antineoplastic agents). • The chemical process that can overcome these drawbacks is called as PRODRUG DESIGN. • SULTAMICILLIN is one such Oral Mutual Prodrug which is completely hydrolyzed into equimolar amounts of Ampicillin and Sulbactam. BENEFITS ✓ The Mutual Prodrug effect of Sultamicillin results from its having a more efficient oral absorption of Ampicillin (3.5 folds more) than plain Ampicillin. ✓ It provides the ß-lactamase inhibitor Sulbactam in the oral form. TH E M UT ✓ Enables a convenient BID dosing. PRODRUG L A U TAB THE SUPER POWER ß-LACTAM… ...SHIELDED WITH SULBACTAM 202, Ketan Apartment, 233, R.B. Mehta Marg, Ghatkopar (East), Mumbai 400 077 Abstract few decades. A therapeutically significant drug may have limited utilization in clinical practice because of various shortcomings like poor organoleptic properties (chloramphenicol), poor bioavailability (ampicillin), short duration of action (pilocarpine), nonspecificity (antineoplastic agents), incomplete absorption (epinephrine), poor aqueous solubility (corticosteroids), high first-pass metabolism (propranolol) or other adverse effects. There is a great emphasis on research to discover methods aimed at improving their therapeutic efficacy by minimizing or eliminating these undesirable properties. Sometimes, an adequate pharmaceutical formulation can overcome these drawbacks, but often the galenic formulation is inoperant and a chemical modification of active molecule is necessary to correct its pharmacokinetic insufficiencies. This chemical formulation process, whose objective is to convert an interesting active molecule into a clinically acceptable drug, often involves the so-called 'Prodrug design.' Mutual prodrug is a type of carrier-linked prodrug, where the carrier used is another biologically active drug instead of some inert molecule. A mutual prodrug consists of two pharmacologically active agents coupled together so that each acts as a promoiety for the other agent and vice versa. Mutual prodrug design is really no different from the general drug discovery process, in which a unique substance is observed to have desirable pharmacological effects, and studies of its properties lead to the design of better drugs. It is a very fruitful area of research, and its introduction in human therapy has given successful results in improving the clinical and therapeutic effectiveness of drugs suffering from some undesirable properties that otherwise hinder their clinical usefulness. The present article takes a review of various applications of mutual prodrugs and the developments in this field during the last Classification of prodrugs Wermuth, after surveying the literature, has classified the prodrugs into two broad categories: the carrier-linked prodrugs and bioprecursors. The carrier-linked prodrug consists of the attachment of a carrier group to the active drug to alter its physicochemical properties and then subsequent enzymatic or nonenzymatic mechanism to release the active drug moiety. Thus, the carrier-linked prodrugs are drugs with major drawbacks that are linked through covalent linkage with specialised nontoxic protective groups or carriers or promoieties in a transient manner to alter or eliminate undesirable properties in the parent molecule. Depending upon the nature of carrier used, the carrier-linked prodrug may further be classified into: 1. Double prodrugs, pro-prodrugs or cascadelatentiated prodrugs, where a prodrug is further derivatized in a fashion such that only enzymatic conversion to prodrug is possible before the latter can cleave to release the active drug. 2. Macromolecular prodrugs, where macromolecules like polysaccharides, dextrans, cyclodextrins, proteins, peptides, and polymers are used as carriers. 3. Site-specific prodrugs where a carrier acts as a transporter of the active drug to a specific targeted site. 4. Mutual prodrug, where the carrier used is another biologically active drug instead of some inert molecule. A mutual prodrug consists of two pharmacologically active agents coupled together so that each acts as a promoiety for the other agent and vice versa. The carrier selected may have the same biological action as that of the parent drug and thus might give synergistic action, or the MUTUAL PRODRUG CONCEPT F U N DA M E N TA L S A N D A P P L I CAT I O N S carrier may have some additional biological action that is lacking in the parent drug, thus ensuring some additional benefit. The carrier may also be a drug that might help to target the parent drug to a specific site or organ or cells or may improve site specificity of a drug. The carrier drug may be used to overcome some side effects of the parent drugs as well. Applications of mutual prodrug approach Reduction of gastrointestinal (GI) side effects and ulcerogenicity of nonsteroidal antiinflammatory drugs (NSAIDs): Despite the intensive research that has been aimed at the development of NSAIDs, their clinical usefulness is still restricted by their GI side effects like gastric irritation, ulceration, bleeding, perforation and in some cases may develop into life threatening conditions. GI lesions produced by NSAIDs are generally attributed to either direct and/or indirect mechanisms. The direct contact effects result usually from local irritation produced by free acidic group of NSAIDs and local inhibition of prostaglandin synthesis in GIT. Indirect mechanism is due to generalized systemic action occurring after absorption and is demonstrated on intravenous dosing. This problem has been solved by derivatization of carboxylic function of NSAIDs into ester and amide mutual prodrugs using amino acids like L-tryptophan, L-histidine, L-glycine as carriers that have marked antiinflammatory activity of their own. Other analgesic, antiinflammatory drugs like paracetamol and salicylamide have also been used as carriers to synthesize mutual prodrugs of NSAIDs, the examples of which are cited below. Benorylate (1) is a mutual prodrug of aspirin and paracetamol, linked through ester linkage, which claims to have decreased gastric irritancy with synergistic analgesic action. Glycine methyl ester conjugate of ketoprofen (2), histidine methyl ester conjugate of diclofenac (3), and various conjugates of flurbiprofen with amino acid like L-tryptophan (4a), L-histidine (4b), phenylalanine (4c) and alanine (4d) as mutual prodrugs were reported to have less ulcerogenicity with better antiinflammatory / MUTUAL PRODRUG CONCEPT F U N DA M E N TA L S A N D A P P L I CAT I O N S analgesic action than their parent drugs. Mutual prodrugs of ibuprofen with paracetamol (5) and salicylamide (6) have been reported with better lipophilicity and reduced gastric irritancy than the parent drug[16]. Naproxen-propyphenazone mutual prodrugs (7) were synthesised with an aim to improve therapeutic index through prevention of GI irritation and bleeding. Esterification of naproxen with different alkyl esters and thioesters led to prodrugs with retained antiinflammatory activity but exhibited greatly reduced GI erosive properties and analgesic potency, but esterification with ethyl piperazine showed that analgesic activity was preserved whereas antiinflammatory activity was generally reduced. Propyphenazone, a nonacidic pyrazole with good analgesic and antipyretic activity, was coupled with naproxen to achieve many advantages related to the synergistic analgesic effect with reduced gastric irritation. Propyphenazone is converted to its active metabolite, 3-hydroxy methyl propyphenazone, which actually gives the analgesic effect. Coupling of these two compounds as a hybrid drug or through a spacer as a mutual prodrug resulted in potent analgesic/antiinflammatory compound with reduced adverse local effects related to NSAID. SULTAMICILLIN ampicillin are achieved that are approximately 3.5- Sultamicillin is an example of a mutual prodrug oral ampicillin. Equimolar concentrations of with synergistic action. In the design of sultamicillin, sulbactam are also provided with both ampicillin the irreversible ß-lactamase inhibitor sulbactam has and sulbactum, being widely distributed among been combined chemically via ester linkage with various ampicillin. This design is based on the rationale that pharmacokinetic parameters of the two components as sulbactam, a ß-Lactamase inhibitor with very are similar, both being eliminated primarily by renal limited antibacterial activity in a physical mixture excretion. Although the elimination half-lives of with ampicillin, clearly enhances the activity of the ampicillin and sulbactam are each approximately 1 latter ß-Lactamase-producing h, the high serum concentration achieved, coupled bacteria, both in vitro and in vivo, the same with their synergistic activity permit twice-daily phenomenon might hold true when these two drugs dosing. One more important advantage presented are linked chemically. Upon oral administration, by sultamicillin is that even though most ß- sultamicillin is completely hydrolyzed to equimolar Lactamase-resistant antimicrobials must be given proportions of sulbactam and ampicillin, thereby parenterally, sultamicillin is given by mouth. It has acting as an efficient mutual prodrug. The mutual been found to be effective against respiratory tract prodrug effect produced by sultamicillin results infection otorhinolaryngological, urinary tract from its having a more efficient oral absorption than infection, skin and soft tissue infection and obstetric Site-specific drug delivery the single agent does. Peak serum concentrations of and gynecological infection. A drug, after its absorption into systemic circulation, gets distributed to target site as well as non-targeted tissues. The distribution of drug to non-targeted tissues may lead to undesirable toxic effects in those tissues and insufficient concentration in the target site to evoke any therapeutic response. If the target site has a longer distribution time, the drug may get eliminated without reaching such a site; and even if the drug reaches the targeted area in sufficient concentrations, it may have such a low penetration power that it may not penetrate the target cells at all. Targeting the drug to its site of action through prodrug concept has been utilized to overcome these problems. Sulfasalazine is the classic example of colon-specific mutual prodrug of 5-aminosalicylic acid (5-ASA) and sulfapyridine, used in the treatment of ulcerative colitis. against certain fold those obtained with an equivalent amount of body fluids and tissues. The