<qa>  What is the name of the clinical trial that will be used to investigate the effectiveness of citaA randomized placebo controlled clinical trial design will be used to investigate the effectiveness of citalopram in patients with anxiety disorder due to a general medical condition, specifically traumatic brain injury TBI. Beneficiaries who are between 3 and 24 months post injury and who meet criteria for DSM-IV diagnosis of anxiety disorder due to TBI will be recruited from the 7 DVBIC VA and Military Medical Centers. Participants will be randomized to receive an increasing dose of citalopram or placebo up to a dose of 40 mg of citalopram or 4 pills of placebo over a 12-week treatment period. Patients will receive comprehensive multidisciplinary evaluations at a DVBIC site, including neurology, neuropsychology and psychiatry interviews and evaluations at baseline, 12 weeks and 12 months. 