Comparative Pharmacology
Head-to-head clinical analysis: SULFATRIM DS versus TRIMETHOPRIM SULFAMETHOXAZOLE.
Peer-Reviewed Evidence
Head-to-head clinical analysis: SULFATRIM DS versus TRIMETHOPRIM SULFAMETHOXAZOLE.
SULFATRIM-DS vs Trimethoprim-Sulfamethoxazole
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Sulfamethoxazole inhibits bacterial dihydropteroate synthase, blocking folate synthesis. Trimethoprim inhibits bacterial dihydrofolate reductase, inhibiting reduction of dihydrofolate to tetrahydrofolate. Sequential blockade of folate metabolism exerts bactericidal effect.
Sulfamethoxazole inhibits dihydropteroate synthase, blocking para-aminobenzoic acid incorporation into dihydrofolate; trimethoprim inhibits dihydrofolate reductase, preventing tetrahydrofolate formation. Sequential blockade of folate synthesis.
One double-strength tablet (160 mg trimethoprim/800 mg sulfamethoxazole) orally every 12 hours.
Oral: 160 mg TMP/800 mg SMX every 12 hours; IV: 8-10 mg/kg/day (based on TMP) in 2-4 divided doses
None Documented
None Documented
SMX: 9-11 hours (terminal); TMP: 8-10 hours; prolonged in renal impairment (creatinine clearance <30 mL/min: up to 20-30 hours for both).
Trimethoprim: 8-10 hours (normal renal function); prolonged to 24-30 hours in severe renal impairment (CrCl <10 mL/min). Sulfamethoxazole: 9-11 hours; prolonged in renal failure. The combination retains a half-life of ~10-12 hours in healthy adults, requiring dose adjustment in renal impairment.
Renal: 50-70% of total sulfamethoxazole (SMX) and 30% of trimethoprim (TMP) as unchanged drug via glomerular filtration and tubular secretion; 20-40% of SMX as N4-acetylated metabolite; biliary excretion accounts for <5%.
Trimethoprim: 50-60% excreted unchanged in urine via glomerular filtration and tubular secretion; 10-20% as metabolites. Sulfamethoxazole: 20-30% excreted unchanged in urine; 50-70% as N4-acetylated metabolite. Both undergo minimal biliary/fecal elimination (<5% total).
Category C
Category C
Sulfonamide Antibiotic
Sulfonamide Antibiotic