Citalopram is a selective serotonin reuptake inhibitor (SSRI). It is commonly used in the treatment of depression and some of the more severe anxiety disorders (e.g., obsessive-compulsive disorder, panic disorder, social anxiety disorder). As with other SSRIs, the most troublesome side effect of citalopram is sexual dysfunction (dysorgas-mia and erectile dysfunction); mild side effects include drowsiness, headache, and nausea. Escitalopram, the S-enantiomer of racemic citalopram, is also marketed as an antidepressant.
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