Celexa is a type of antidepressant medication. It belongs to the selective serotonin reuptake inhibitor (SSRI) group of medicines. This medicine is also used to treat a panic disorder of the patient. Various doses are available for the patient, such as Celexa 5 mg, Celexa 20 mg, Celexa 30 mg, Celexa 40 mg, and Celexa 60 mg. Your doctor will decide what dose the patient will take. Celexa 40 mg will take with or without food. You should not change the dose or stop taking it without consulting even if you feel better. You may feel unpleasant withdrawal symptoms anxiety, restlessness, palpitations, dizziness, sleep disturbances, etc.