Avoid concomitant use w/ artemether, BCG, dronedarone, lumefantrine, nilotinib, pimozide, quinine, tetrabenazine, thioridazine & ziprasidone. May increase effects of cardiac glycosides, cyclosporine, dronedarone, pimozide, QTc-prolonging agents, quinine, tacrolimus, tetrabenazine, thioridazine, vit K antagonist & ziprasidone. Effect may be increased by alfuzosin, artemether, chloroquine, ciprofloxacin, conivaptan, gadobutrol, lumefantrine, nilotinib & quinine. May decrease effects of BCG & typhoid vaccine.