 - Patients taking Central Nervous System CNS or other psychotropic drugs, or any nutritional supplement known to have psychotropic effects such as St. Johns Wort, Chapparal, Comfrey, Germander, Gin Bu Huan, Kava, Pennyroyal Skullcap, or Valerian within two months of taking the first dose of study medication. Patients who have been on stable doses of these medications for at least two months will be allowed into the study, as long as they maintain this dose throughout the study, and their condition is judged stable by the Principal Investigator 