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Sparteine is a class 1a antiarrhythmic agent; a sodium channel blocker. It is an alkaloid and can be extracted from scotch broom. It is the predominant alkaloid in Lupinus mutabilis, and is thought to chelate the bivalents calcium and magnesium. It is not FDA approved for human use as an antiarrhythmic agent, and it is not included in the Vaughn-Williams class of antiarrhythmic drugs.
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