Rolf Schulz noticed: "Celexa is the newest antidepressant to be approved by theFDA. Take Celexa exactly as it was prescribed for you. Celexa is a selective serotonin reuptake inhibitor used to treat the symptoms of depression but can also be prescribed for social anxiety disorder, panic disorder or obsessive-compulsive disorder. Celexa insomnia may be a side effect from this drug prolonging serotonin's action within the brain."