- Veteran is taking simvastatin, lovastatin, fentanyl, pimozide, bupropion, nefazodone, dihydroergotamine, ergotamine, quinidine, sirolimus, tacrolimus, or clarithromycin, cyclosporine, St. John's Wort, diltiazem, verapamil, propranolol, alprazolam, carvedilol or some anticonvulsants (phenytoin, phenobarbital, or carbamazepine) within five half-lives prior to randomization.