The purpose of this study is to evaluate whether repetitive transcranial magnetic stimulation (rTMS) treatment is an effective adjunct treatment to mood stabilizers and Bupropion.

Inclusion Criteria:

BD Type I or II subjects diagnosed according to the Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) in depressed phase.

Age 18 to 70. Rating on the Montgomery-Asberg Depression Rating Scale (MADRS) score > 20. Rating on the Beck Depression Inventory (BDI-II) > 20. Rating on the Young Mania Rating Scale (YMRS) < 8. Non-treated new depressive episode, at least 2 weeks in duration. If recently started on an antidepressant other than Wellbutrin, subject must spend at least 4 weeks at a therapeutic dose before entering the study.

Lithium and epival (Sodium Valproate) in monotherapy or in combination. Novel antipsychotics can be combined with mood stabilizers for at least 4 weeks at a steady dosage prior to the study.

Exclusion Criteria:

History of any DSM-IV Axis I diagnosis other than BD Type I or II Presence of any psychotic symptoms, characterized by a score of 3 or more on item 10 of the MADRS, a score of 6 on item 9 of the MADRS, or a score of 6 or more on item 8 of the YMRS Comorbid active dependence or substance abuse (except nicotine) Prior electroconvulsive therapy failure Pacemaker, automatic implantable defibrillator or implantable pump Aneurysm Clip Heart/Vascular Clip Prosthetic Valve Metal Prosthesis Pregnancy (must do a blood β-HCG test to exclude) Metal or metal fragments in the head Personal or Family history of seizure disorder Increased Intracranial pressure History of stroke, meningitis/encephalitis, moderate to severe traumatic brain injury, neurosurgical procedure Pharmacotherapy using any substances not mentioned in the inclusion criteria, except benzodiazepines at an equivalent dose of less than or equal to 1mg/day of lorazepam.

Failure of previous Wellbutrin treatment. Mood disorder secondary to a medical condition. Subject currently enrolled in any detoxification program