Quinidine (15% dihydroquinidine) (Standard) is the analytical standard of Quinidine (15% dihydroquinidine). This product is intended for research and analytical applications. Quinidine (15% dihydroquinidine) is an antiarrhythmic agent. Quinidine is a potent, orally active, selective cytochrome P450db inhibitor. Quinidine is also a K+ channel blocker with an IC50 of 19.9 µM, and can induce apoptosis. Quinidine can be used for malaria research[1][2][3][4].