Sertraline is an antidepressant that belongs to a group of medicines called selective serotonin reuptake inhibitors (SSRIs). It works by increasing the amount of a natural chemical called serotonin in the brain. Sertraline improves or relieves the symptoms of depression, OCD, post-traumatic stress disorder, obsessive-compulsive disorder, panic disorder, and premenstrual dysphoric disorder via the inhibition of serotonin reuptake. Clinical studies have shown that it improves cognition in depressed patients. It has less sedative, anticholinergic, and cardiovascular effects than tricyclic antidepressant drugs because it does not exert significant anticholinergic, antihistamine, or adrenergic (alpha1, alpha2, beta) blocking activity. The onset of action and beneficial effects are usually noticed after 4-6 weeks, for reasons that are not fully understood and currently under investigation