alfuzosin (Uroxatral), cisapride (Propulsid), pimozide (Orap), atorvastatin (Lipitor, Caduet), lovastatin (Mevacor, Altoprev, Advicor) or
simvastatin (
Zocor, Simcor, Vytorin), midazolam (Versed), triazolam (Halcion), sildenafil (Revatio) or tadalafil (Adcirca) when used to treat pulmonary arterial hypertension, St. John's wort, rifampin (Rifadin, Rifater, Rifamate), ergonovine, ergotamine (Ergomar, Cafergot, Migergot), dihydroergotamine (D.H.E.