Anticoagulants, barbiturates, beta blockers, cardiac glycoside derivatives, chloramphenicol, corticosteroids, cyclo-sporine, dapsone, disopyramide, estrogens, methadone, oral contraceptives, oral sulfony-lureas, phenytoin, quinidine, tocainide, verapamil:Reduced effectiveness of these drugs. Monitor child and adjust dosages as needed.
Isoniazid: Accelerated metabolic conversion of isoniazid to hepatotoxic metabolites; increased hazard of isoniazid hepatotoxicity. Monitor child for toxicity if used together.
Para-aminosalicylate: Decreased oral absorption of rifampin, lowering serum levels. |