Pay less for Celexa by choosing to buy from our network. Uninsured? Underinsured? Get your Free Membership and start saving today! Enjoy the convenience and safety of having Celexa directly in your home. Celexa is an oral antidepressant used to relieve symptoms and reduce the frequency of relapses of major depressive disorder. Celexa helps to reduce depression symptoms in the first week of the treatment. However, to achieve a long-lasting antidepressant effect, Celexa tablets are advised to use within a few weeks or months.