Increased plasma conc of 5-FU. Decreased clearance w/ nephrotoxic compd. Avoid use w/ intravesical BCG, deferiprone, dipyrone, natalizumab, pimecrolimus, topical tacrolimus, live vaccines. Increased effect/toxicity of clozapine, deferiprone, fingolimod, leflunomide, natalizumab, highest & moderate risk QTc-prolonging agents, taxane derivatives, tofacitinib, topotecan, live vaccines. Increased levels/effects w/ bupropion, ophth chloramphenicol, denosumab, dipyrone, mifepristone, ocrelizumab, palifermin, pimecrolimus, promazine, roflumilast, topical tacrolimus, trastuzumab. Decreased levels/effects of intrevesical BCG,
Coccidioides immitis skin test, fosphenytoin-phenytoin, lenograstim, lipegfilgrastim, nivolumab, pidotimod, sipuleucel-T, tertomotide, inactivated & live vaccines. Decreased levels/effects w/ Echinacea.