Quinoidine n. : A brownish resinous substance obtained as a by-product in the treatment of cinchona bark. It consists of a mixture of several alkaloids.

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Taxonomy
quinidine gluconate, yl, methanol, free encyclopedia, inward, Side effects, heart rates, inhibitor, Antiarrhythmic agents, the block, depolarization, ECG, drugs, symptoms, treatment, AJ, quinine, cardiac action potential.

Defination from the web:
Quinidine is a pharmaceutical agent that acts as a class I antiarrhythmic agent (Ia) in the heart. ... Quinidine also blocks the slowly inactivating tetrodotoxin-sensitive Na current, the slow inward calcium current (ICa), the rapid (IKr) and slow ...