Warfarin, also known as Coumadin, is an anti-coagulant used to thin the blood to reduce clotting. It is usually administered orally in doses of 1, 2, 2.5, 3, 4.5, 5, 6, 7.5 and 10 mg. The drug is absorbed into the blood within four hours, relating, here to a constant of absorption (Ka) of 1. The drug has a half-life of approximately 40 hours, and an apparent volume of distribution of 0.14 L/kg. The information presented here, and further clinical information regarding this drug, can be found at the DuPont Merck Website.

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