Comparative Pharmacology
Head-to-head clinical analysis: SULFAMETHOXAZOLE AND TRIMETHOPRIM DOUBLE STRENGTH versus XIMINO.
Peer-Reviewed Evidence
Head-to-head clinical analysis: SULFAMETHOXAZOLE AND TRIMETHOPRIM DOUBLE STRENGTH versus XIMINO.
SULFAMETHOXAZOLE AND TRIMETHOPRIM DOUBLE STRENGTH vs XIMINO
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Sulfamethoxazole inhibits bacterial dihydropteroate synthase, blocking folic acid synthesis. Trimethoprim inhibits bacterial dihydrofolate reductase, blocking reduction of dihydrofolate to tetrahydrofolate. Sequential blockade produces bactericidal effect.
XIMINO is a tetracycline-class antibiotic that inhibits bacterial protein synthesis by binding to the 30S ribosomal subunit, preventing aminoacyl-tRNA from binding to the mRNA-ribosome complex.
One double-strength tablet (160 mg trimethoprim/800 mg sulfamethoxazole) orally every 12 hours.
400 mg orally twice daily with food for 7 days.
None Documented
None Documented
Sulfamethoxazole: 9-11 hours; trimethoprim: 8-11 hours. In severe renal impairment (CrCl <15 mL/min), half-life prolongs significantly (up to 30 hours for trimethoprim).
Terminal elimination half-life: 8 hours (range 6-10 hours) in healthy adults; prolonged to 15-20 hours in severe renal impairment (CrCl <30 mL/min).
Both sulfamethoxazole and trimethoprim are primarily excreted via the kidneys. Sulfamethoxazole: ~30% as unchanged drug, ~50% as N4-acetyl metabolite; trimethoprim: ~80% as unchanged drug. Fecal elimination is minimal (<5%).
Renal: 70% as unchanged drug; biliary/fecal: 20% as metabolites and unchanged drug; 10% metabolized via hepatic CYP3A4.
Category D/X
Category C
Antibiotic
Antibiotic