Comparative Pharmacology
Head-to-head clinical analysis: COTRIM D S versus FORBAXIN.
Peer-Reviewed Evidence
Head-to-head clinical analysis: COTRIM D S versus FORBAXIN.
COTRIM D.S. vs FORBAXIN
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
COTRIM D.S. is a combination of sulfamethoxazole, a competitive inhibitor of dihydropteroate synthase, and trimethoprim, a reversible inhibitor of dihydrofolate reductase. This sequential blockade of folate synthesis leads to bactericidal activity.
FORBAXIN is a prodrug of the active moiety cefditoren, a cephalosporin antibiotic that inhibits bacterial cell wall synthesis by binding to penicillin-binding proteins (PBPs), leading to cell lysis and death.
160 mg trimethoprim / 800 mg sulfamethoxazole (one double-strength tablet) orally every 12 hours.
IV: 500 mg every 12 hours, infused over 30 minutes.
None Documented
None Documented
Sulfamethoxazole: 9-12 hours (normal renal function). Trimethoprim: 8-11 hours. Both are prolonged in renal impairment (e.g., creatinine clearance <30 mL/min: >24 hours). Clinical context: dosing interval is typically 12 hours; dose adjustment required if CrCl <30 mL/min.
8-12 hours; prolonged in renal impairment (up to 24 hours in severe cases)
Sulfamethoxazole: ~20% unchanged in urine, remainder as acetylated and glucuronide metabolites. Trimethoprim: ~50-80% unchanged in urine, remainder as oxidative metabolites. Both undergo renal excretion via glomerular filtration and tubular secretion. Total renal elimination: 70-90% of dose combined. Biliary/fecal: <10%.
Renal (60-70% unchanged), biliary/fecal (20-30%)
Category C
Category C
Antibiotic
Antibiotic