Avanir Pharmaceuticals, Inc. today announced that the European Commission has approved NUEDEXTA® (dextromethorphan hydrobromide/quinidine sulfate) in the European Union for the treatment of pseudobulbar affect (PBA), irrespective of underlying neurologic disease or injury.
NUEDEXTA is an oral formulation of dextromethorphan hydrobromide USP and quinidine sulfate USP in a fixed dose combination.
Dextromethorphan hydrobromide is the pharmacologically active ingredient of NUEDEXTA that acts on the central nervous system (CNS). The chemical name is dextromethorphan hydrobromide: morphinan, 3-methoxy-17-methyl-, (9α, 13α, 14α)- hydrobromide monohydrate. Dextromethorphan hydrobromide has the empirical formula C18H25NO•HBr•H2O with a molecular weight of 370.33. The structural formula is:
Quinidine sulfate is a specific inhibitor of CYP2D6-dependent oxidative metabolism used in NUEDEXTA to increase the systemic bioavailability of dextromethorphan. The chemical name is quinidine sulfate: cinchonan-9-ol, 6’-methoxy- (9S) sulfate (2:1), (salt), dihydrate. Quinidine sulfate dihydrate has the empirical formula of (C20H24N2O2)2•H2SO4•2H2O with a molecular weight of 782.96. The structural formula…