Pharmacokinetics And Metabolism

Colchicine absorption is rapid but variable. Peak plasma concentrations occur 0.5-2 hours after dosing. In plasma, 50% of colchicine is protein-bound. There is significant enterohepatic circulation. The exact metabolism of colchicine is unknown but seems to involve deacetylation by the liver. Only 10-20% is excreted in the urine, although this increases in patients with liver disease. The kidney, liver, and spleen also contain high concentrations of colchicine, but it apparently is largely excluded from heart, skeletal muscle, and brain. The plasma t122 of colchicine is -9 hours, but it can be detected in leukocytes and in the urine for at least 9 days after a single intravenous dose.

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