<qa>  What is the name of the anticonvulsants that are taken in the half-live- Veteran is taking simvastatin, lovastatin, fentanyl, pimozide, bupropion, nefazodone, dihydroergotamine, ergotamine, quinidine, sirolimus, tacrolimus, or clarithromycin, cyclosporine, St. Johns Wort, diltiazem, verapamil, propranolol, carvedilol or some anticonvulsants phenytoin, phenobarbital, or carbamazepinewithin five half-lives prior to randomization. 