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.