Patients with this genotype have increased frequency of suicidal ideation with citalopram
References
Laje G, Paddock S, Manji H, Rush AJ, Wilson AF, Charney D, McMahon FJ: Genetic markers of suicidal ideation emerging during citalopram treatment of major depression. Am J Psychiatry. 2007 Oct;164(10):1530-8. [Article]