Yui Abe noticed: "Citalopram is an antidepressant in a group of drugs called selective serotonin reuptake inhibitor used to treat depression. Celexa causes less drug interactions, you should always let your doctor know what other medications you are taking. You are taking. Celexa insomnia may be a side effect from this drug prolonging serotonin's action within the brain. Celexa appears to be safe to use on a long-term basis and may cause less withdrawal when use is stopped. It is recommended that Celexa be administered as a single oral dose of 20 mg daily. Celexa may cause suicidal thoughts or ideation. It could be implicated in Celexa insomnia."