Pharmacokinetic Properties

Rifampin is well absorbed orally, and a peak serum concentration is usually seen within 2 to 4 hours. Drug ab sorption is impaired if rifampin is given concurrently with aminosalicylic acid or is taken immediately after a meal. It is widely distributed throughout the body, and therapeutic levels are achieved in all body fluids, including cerebrospinal fluid. Rifampin is capable of inducing its own metabolism, so its half-life can be reduced to 2 hours within a week of continued therapy. The deacetylated form of rifampin is active and undergoes biliary excretion and enterohepatic recirculation. Most of the drug is excreted into the GI tract and a small amount in the urine. Moderate dose adjustment is required in patients with underlying liver disease.

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