"Celexa is an antidepressant from the family of drugs known as selective serotonin reuptake inhibitors or SSRIs.
Celexa helps to restore the brain's chemical balance by increasing the supply of a chemical messenger in the brain called serotonin. Because Celexa appears to relieve depression by increasing serotonin with minimal effect on many of the other chemicals in the brain, it may cause relatively few and mild side effects, which tend to go away with continued treatment." - www.celexa.com