Trimethoprim-sulfamethoxazole (Bactrim) is classified as what type of antibiotic?

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Multiple Choice

Trimethoprim-sulfamethoxazole (Bactrim) is classified as what type of antibiotic?

Explanation:
Trimethoprim-sulfamethoxazole is classified as a sulfa antibiotic. Sulfonamides work by disrupting bacterial folate synthesis— sulfamethoxazole mimics PABA and blocks dihydropteroate synthase, halting the production of dihydrofolic acid and thymidine needed for DNA. The companion drug, trimethoprim, blocks a later step in the same pathway (dihydrofolate reductase), giving a strong, often bactericidal effect due to sequential blockade. This mechanism is different from penicillins that disrupt cell wall synthesis, macrolides that inhibit protein synthesis at the 50S subunit, or tetracyclines that inhibit the 30S subunit. So the best classification is a sulfa antibiotic.

Trimethoprim-sulfamethoxazole is classified as a sulfa antibiotic. Sulfonamides work by disrupting bacterial folate synthesis— sulfamethoxazole mimics PABA and blocks dihydropteroate synthase, halting the production of dihydrofolic acid and thymidine needed for DNA. The companion drug, trimethoprim, blocks a later step in the same pathway (dihydrofolate reductase), giving a strong, often bactericidal effect due to sequential blockade. This mechanism is different from penicillins that disrupt cell wall synthesis, macrolides that inhibit protein synthesis at the 50S subunit, or tetracyclines that inhibit the 30S subunit. So the best classification is a sulfa antibiotic.

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