Avoid terfenadine, astemizole, mizolastine, cisapride, triazolam, midazolam, dofetilide, quinidine, pimozide, simvastatin, lovastatin. Oral anticoagulants, saquinavir, vinca alkaloids, busulfan, docetaxel, dihydropyridines, verapamil, cyclosporine, tacrolimus, sirolimus, oral hypoglycaemics, phenytoin, carbamazepine, buspirone, alfentanil, sildenafil, alprazolam, brotizolam, rifabutin, methylprednisolone, trimetrexate, ebastine, reboxetine.