Celexa off: "Like any antidepressant, not everyone responds or tolerates any given medication. Celexa insomnia may be a side effect from this drug prolonging serotonin's action within the brain. Celexa was shown to be effective in treating post-stroke depression and in alleviating emotional disturbances in elderly consumers with dementia disorders. Do not take Celexa together with a monoamine oxidase inhibitor. Celexa is an antidepressant drug used to treat depression associated with mood disorders."