Comparative Pharmacology
Head-to-head clinical analysis: COTRIM D S versus MYCIFRADIN.
Peer-Reviewed Evidence
Head-to-head clinical analysis: COTRIM D S versus MYCIFRADIN.
COTRIM D.S. vs MYCIFRADIN
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.
Aminoglycoside antibiotic that binds to the 30S ribosomal subunit, inhibiting bacterial protein synthesis by causing misreading of mRNA and incorporation of incorrect amino acids into the growing peptide chain.
160 mg trimethoprim / 800 mg sulfamethoxazole (one double-strength tablet) orally every 12 hours.
1-2 g orally every 6 hours for 7-14 days. Or 500 mg intramuscularly every 12 hours.
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.
Terminal elimination half-life is 9–12 hours in patients with normal renal function; may extend to >20 hours in impaired renal function, necessitating dose adjustment.
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%.
Primarily renal excretion of unchanged drug via glomerular filtration; >90% of absorbed dose excreted unchanged in urine within 24 hours. Minor biliary excretion (<1%) with fecal elimination accounting for <1%.
Category C
Category C
Antibiotic
Antibiotic