Depression is a serious medical illness that can recur more than once in a person's lifetime. Effective treatment methods are needed to maintain a state of remission in people who have had prior episodes of depression. IPT is a brief and highly structured type of psychotherapy that addresses interpersonal issues associated with depression. Previous studies have shown that it is an effective method for treating depression. This study will evaluate the effectiveness of maintenance ITP in preventing relapse of depression in women who have required combined psychotherapy and pharmacotherapy treatment to obtain remission of depressive symptoms.