While Celexa has helped millions, there are still millions who are suffering from depression who could be helped but are too embarrassed to tell a doctor about their condition. Do not stop using Celexa without first talking to your doctor. Celexa is an antidepressant medication that affects neurotransmitters, the chemical transmitters within the brain. Ssri medications affect the levels of serotonin in the brain. Celexa is the newest antidepressant to be approved by theFDA. You first start taking an MAO inhibitor before you can take Celexa. The help of Celexa online pharmacies. After stopping an MAO inhibitor before you can take Celexa.