Drug Information for SULFAMETHOXAZOLE AND TRIMETHOPRIM ORAL SUSPENSION, USP (CHERRY FLAVOR) and SULFAMETHOXAZOLE AND TRIMETHOPRIM ORAL SUSPENSION, USP (GRAPE FLAVOR) 200 mg/40 mg per 5 mL (Qualitest Pharmaceuticals): DESCRIPTION

Sulfamethoxazole and trimethoprim oral suspension is a synthetic antibacterial combination product for oral administration.

Each teaspoonful (5 mL) of sulfamethoxazole and trimethoprim oral suspension (cherry flavor) contains 40 mg trimethoprim and 200 mg sulfamethoxazole and the inactive ingredients alcohol not more than 0.5%; methylparaben 0.1% and sodium benzoate 0.1% (added as preservatives), cherry marasque flavor, citric acid, FD&C Red #40, FD&C Yellow #6, glycerin, microcrystalline cellulose, polysorbate 80, purified water, saccharin sodium, sodium carboxymethylcellulose, and sorbitol solution.

Each teaspoonful (5 mL) of sulfamethoxazole and trimethoprim oral suspension (grape flavor) contains 40 mg trimethoprim and 200 mg sulfamethoxazole and the inactive ingredients alcohol not more than 0.5%; methylparaben 0.1% and sodium benzoate 0.1% (added as preservatives), artificial grape flavor, citric acid, FD&C Blue #1, FD&C Red #40, glycerin, microcrystalline cellulose, polysorbate 80, purified water, saccharin sodium, sodium carboxymethylcellulose, and sorbitol solution.

Trimethoprim is 5-[(3,4,5-trimethoxyphenyl) methyl]-2,4-pyrimidinediamine. It is a white to light yellow, odorless, bitter compound with a molecular weight of 290.32, and the molecular formula C₁₄H₁₈N₄O₃. The structural formula is:

Sulfamethoxazole is 4-amino-N-(5-methyl-3-isoxazolyl) benzenesulfonamide. It is an almost white, odorless, tasteless compound with a molecular weight of 253.28, and the molecular formula C₁₀H₁₁N₃O₃S. The structural formula is: