May increase the plasma concentrations of oral anticoagulants, digoxin, cilostazol, alprazolam, midazolam (IV), repaglinide, corticosteroids (e.g. budesonide, dexamethasone, fluticasone, methylprednisolone). May increase plasma concentration w/ HIV protease inhibitors (e.g. ritonavir, indinavir, saquinavir), erythromycin, clarithromycin. May reduce plasma concentration w/ isoniazid, carbamazepine, nevirapine, phenytoin, Phenobarbital, rifampicin, rifabutin. May reduce absorption w/ PPIs, antacids, antimuscarinics, histamine H2 receptor antagonists. Concomitant use w/ dihydropyridines may cause oedema. May increase negative inotropic effects of verapamil. May increase risk of potentially fatal resp depression w/ fentanyl. Potentially Fatal: May increase risk of QT prolongation or torsades de pointes w/ astemizole, bepridil, cisapride, dofetilide, levacetylmethadol (levomethadyl),...
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