Quinidine Class IA prototype antiarrhythmic. Dextroisomer of quinine. Antimalerial and anti pyretic action. Pharmacological structure Obtained from Cinchana Plant. Twobasic Nitrogens. pK-10. Reduces Na ion  current by binding to open Na ion  channels resulting in depression of automaticity of ectopic foci. Available as sulphate ,gluconate. Quinidine sulphate is oral  prepn  commonly,can be available as IM. […]