This study will last 16 weeks and will comprise 2 phases. Phase 1 is an open label in which all participants will receive daily escitalopram for 8 weeks. Those who have responded to treatment at the end of the 8 weeks will be randomly assigned to either continue or discontinue their treatment for an additional 8 weeks. Those who do not respond to treatment at the end of Phase 1 will discontinue the study and be offered three free visits with a study clinician or referred elsewhere for treatment, based on the their preference. Study visits are made at baseline, and at Weeks 1, 2, 4, and 8 in Phase 1 and Weeks 12 and 16 in Phase 2.