3. Patients who require any of the following medications are excluded from enrollment: Carbamazepine, Oxcarbazepine, Primidone, Phenobarbital, Topiramate, Carbapenem antibiotics (ertapenem, imipenem, meropenem), Felbamate, Isoniazid, Lamotrigine, Macrolide antibiotics (clarithromycin, erythromycin, troleandomycin, azithromycin), Zidovudine, Risperidone, Salicylates.