Comparative Pharmacology
Head-to-head clinical analysis: SULFAMYLON versus SULFATRIM.
Peer-Reviewed Evidence
Head-to-head clinical analysis: SULFAMYLON versus SULFATRIM.
SULFAMYLON vs SULFATRIM
Comparing the clinical profiles, pharmacokinetic behaviors, and safety indices of these two therapeutic agents.
Sulfamylon (mafenide acetate) is a synthetic sulfonamide that exerts bacteriostatic activity against a wide range of Gram-negative and Gram-positive organisms. It acts by inhibiting the enzyme dihydropteroate synthase, which is involved in folate synthesis, thereby blocking bacterial DNA replication. Additionally, it may be bactericidal at high concentrations via inhibition of cell wall synthesis.
Sulfatrim is a combination of sulfamethoxazole, a dihydropteroate synthase inhibitor that blocks folate synthesis, and trimethoprim, a dihydrofolate reductase inhibitor that blocks reduction of dihydrofolate to tetrahydrofolate, resulting in sequential inhibition of bacterial folate metabolism.
Topical: Apply a thin layer to the wound once or twice daily. Maximum coverage area should not exceed body surface area of 20%.
160 mg trimethoprim / 800 mg sulfamethoxazole (1 DS tablet) orally every 12 hours for 10-14 days.
None Documented
None Documented
The terminal elimination half-life is approximately 7-8 hours in patients with normal renal function. In renal impairment, half-life may be prolonged, requiring dosing adjustments.
Sulfamethoxazole: 9-11 hours (prolonged in renal impairment, e.g., up to 30 hours in severe renal failure). Trimethoprim: 8-10 hours (prolonged in hepatic impairment).
Primarily renal excretion as unchanged drug and its metabolite; approximately 87% of a dose is recovered in urine within 24 hours as sulfacetamide and its deacetylated metabolite, with about 10% as unchanged drug. Less than 2% is excreted in feces.
Renal (70-80% as unchanged sulfamethoxazole and N4-acetylated metabolite; 30-40% as unchanged trimethoprim), biliary/fecal (20-30% sulfamethoxazole; 10-20% trimethoprim)
Category C
Category C
Sulfonamide Antibiotic
Sulfonamide Antibiotic