dextromethorphan hydrobromide and quinidine sulfate - Medication Listings

Dextromethorphan hydrobromide and quinidine sulfate capsules are an oral formulation of dextromethorphan hydrobromide USP and quinidine sulfate USP in a fixed dose combination. Dextromethorphan hydrobromide is the pharmacologically active ingredient of dextromethorphan hydrobromide and quinidine sulfate capsules that acts on the central nervous system (CNS). The chemical name of dextromethorphan hydrobromide is morphinan, 3-methoxy-17-methyl-, (9α, 13α, 14α), hydrobromide monohydrate. Dextromethorphan hydrobromide has the molecular formula C 18 H 25 NO•HBr•H 2 O with a molecular weight of 370.33. The structural formula is: Quinidine sulfate is a specific inhibitor of CYP2D6-dependent oxidative metabolism used in dextromethorphan hydrobromide and quinidine sulfate capsules to increase the systemic bioavailability of dextromethorphan. The chemical name of quinidine sulfate is cinchonan-9-o1, 6’-methoxy-, (9S) sulfate (2:1), (salt), dihydrate. Quinidine sulfate dihydrate has the molecular formula of (C 20 H 24 N 2 O 2 )2•H 2 SO 4 •2H 2 O with a molecular weight of 782.96. The structural formula is: The combination product, dextromethorphan hydrobromide and quinidine sulfate capsules, is a white to off-white powder. Dextromethorphan hydrobromide and quinidine sulfate capsules are available for oral use, which contains 20 mg dextromethorphan hydrobromide, USP and 10 mg quinidine sulfate, USP. The active ingredients are dextromethorphan hydrobromide, USP and quinidine sulfate, USP. Inactive ingredients in the capsule are colloidal silicon dioxide, croscarmellose sodium, lactose monohydrate, magnesium stearate and microcrystalline cellulose. The capsule shell contains gelatin and titanium dioxide. The black imprinting ink contains ammonia solution, iron oxide black, potassium hydroxide, propylene glycol, and shellac. dextromethorphan-hydrobromide-structure quinidine-sulfate-structure