- Who are currently taking, or who have taken any of the following medications within 4 weeks of the Screening Visit (Visit -1): Monoamine oxidase inhibitors (phenelzine, tranylcypromine); Tricyclic and tetracyclic antidepressants; beta adrenergic blocker drugs (both oral and topical); Anticonvulsants (carbamazepine, phenobarbital, phenytoin, mephobarbital, primidone, ethosuximide, methsuximide, felbamate, gabapentin, lamotrigine, levetiracetam, oxcarbazepine, tiagabine, topiramate, valproic acid, divalproex sodium, zonisamide); Protease inhibitors (ritonavir, indinavir, nelfinavir); Calcium channel blockers (verapamil, diltiazem); Modafinil; Tamoxifen; non-nucleoside reverse transcriptase inhibitors; Macrolide antibiotics* (erythromycin, clarithromycin, dirithromycin, troleandomycin); chloramphenicol; nefazodone; aprepitant; St John's Wort; Rifampin*; Azole Antifungals* (ketoconazole, fluconazole, itraconazole); Sibutramine* ; bergamottin (constituent of grapefruit juice) (*may be rescreened if this therapy is short-lived);