Drug Summary

  Drug name:  quinidine
  Chemical name:  Quinidine hydrochloride monohydrate
  Formula:  C₂₀H₂₄N₂O_{2  Weight:   324.4168
  CAS no:  56-54-2
  DrugBank link:  DB00908
  Description:  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. [PubChem]
  Indication:  For the treatment of ventricular pre-excitation and cardiac dysrhythmias}