Celexa is mainly used as the treatment pill of depression. Its generic name is Citalopram. You can buy Celexa online, and from the pharma store easily with a prescription. Citalopram works by increasing the levels of serotonin, a neurotransmitter in the brain that helps regulate mood, emotions, and behavior. By preventing the reuptake of serotonin, and reducing symptoms of depression and anxiety. It is available in Three different dosages those are 10mg , 20mg , 40mg.