产品描述 | Quinidine N-oxide is a pharmacologically inactive quinidine metabolite. Quinidine, an antiarrhythmic agent, undergoes rapid first-pass metabolism by the cytochrome P450 isoforms CYP3A4, CYP2C9, and CYP2E1, with CYP3A4 being the most active enzyme in quinidine N-oxide formation. |