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What is quinidine?

Quinidine is used to treat irregular heartbeats known as arrhythmia. Quinidine is an anti-arrhythmic drug. It interferes with the movement of sodium across membranes in cells. This sodium flow is necessary to stimulate heartbeats. By changing the flow of sodium across the membranes, the speed and frequency at which the heart beats is regulated. Quinidine also relaxes muscles in the arteries, lowering blood pressure. Quinidine in combination with doxycycline may also be prescribed to treat some strains of malaria that are resistant to chloroquine. Quinidine is available under the brand names Quin-Release, Quinaglute Dura-Tabs, Quinidex Extentabs, Biquin Durules, Cardioquin, Quinora, and Quin-G.

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