In certain subtypes of alcoholics. Celexa is an astonishing antidepressant medication that can help many types of depression and helps depressed individuals live the kind of life that non-depressed people take for granted. It makes your neurons soak for a longer period of time in the serotonin you already produce. Do not take Celexa. You first start taking an MAO inhibitor before you can take Celexa. Generally begins to work within the first two weeks of treatment, but it can take four to six weeks to see the full effect.