Theophylline, carbamazepine, terfenadine, digoxin, zidovudine, triazolam.
Clariget Warfarin, ergot alkaloids, midazolam, cyclosporine, other macrolides.
Clariget OD Astemizole, pimozide, cisapride, ergotamine or dihydroergotamine, when in combination w/ ranitidine bismuth citrate on patients w/ a history of acute porphyria; drugs metabolized by the CYP450, quinidine or disopyramide, HMG-CoA reductase inhibitors, oral anticoagulants, ritonavir, efavirenz, nevirapine, rifampicin, rifabutin, sildenafil, tadalafil, vardenafil, colchicine, itraconazole.