Paxil is an effective medication used most commonly to treat major depressive disorder (MDD) and generalized anxiety disorder (GAD). It affects the Central Nervous System and brain used to treat anxiety disorder. The medicine affects chemicals in the brain that control depression, anxiety, or other disorders of the patient. Paxil is used to treat panic disorder, obsessive-compulsive disorder (OCD), anxiety disorders, and premenstrual dysphoric disorder (PMDD). There are different forms and various doses of this medicine available. The variety of doses are Paxil 5 mg, Paxil 10 mg, Paxil 20 mg, Paxil 25 mg, Paxil 30 mg, and Paxil 40 mg. At the initial stage, you should use a lower dose of Paxil 5 mg of the medication. You should not use Paxil if you are also taking an MAO inhibitor, such as isocarboxazid, linezolid, methylene blue injection, phenelzine, rasagiline, selegiline, or tranylcypromine within 14 days before or 14 days.