Canadian Medical Guide > Chemicals and Drugs > Heterocyclic Compounds > Alkaloids > Cinchona Alkaloids > Quinidine Terms and Definitions




Quinidine

Medical Definition: An optical isomer of quinine, extracted from the bark of the Cinchona tree and similar plant species. This alkaloid dampens the excitability of cardiac and skeletal muscles by blocking sodium and potassium currents across cellular membranes. It prolongs cellular action potential, and decreases automaticity. Quinidine also blocks muscarinic and alpha-adrenergic neurotransmission.
Also Called: Quinidine Sulfate,Quinora
CAS Type 1 Name: CAS Number: 56-54-2

Quinidine Medical Definitions and Terms

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