Increased hepatotoxicity w/ barbiturates, TCAs & alcohol. Prolonged plasma t
½ w/ alcohol. Increased absorption by metoclopramide or domperidone; reduced absorption by colestyramine. Enhanced anticoagulant effect of warfarin & other coumarins. Possible reduced metabolism of zidovudine. Reduced plasma conc & faster elimination rate w/ anticonvulsants & OCs.