- Participants whose depression is in remission are eligible for study enrollment. Criteria for remission includes more than 3 consecutive weeks during which the patient does not meet DSM-IV criteria for depression; a Hamilton Rating Depression Scale score less than 6 and a Beck Depression Inventory (BDI) less than 6; no feelings of depression for at least 6 months prior to study entry; and have not taken depression medication for at least 3 months prior to study entry. Once enrolled in the study, these participants must score less than 6 on the weekly BDIs for the first 3 weeks of the study.