 Patients will receive an increasing dose of citalopram or placebo up to a dose of 40 mg of citalopram or 4 pills of placebo. See Table 2 for dosing schedule. A blood sample up to 1 tablespoon drawn after completion of the 12-week treatment period will be used to obtain citalopram levels as a measure of medication compliance. A two-week taper will follow the treatment period. Patients will receive comprehensive multidisciplinary evaluations at a DVBIC site, including neuropsychological and psychiatric interviews and evaluations at baseline, 12 weeks and 12 months. 