Antidepressants are prescribed to treat major depressive disorder (mdd), anxiety disorders, chronic pain, and some addictions. Antidepressants are often used in combination with one another. The different types of antidepressants include tcas, ssris, snris, and maois, which are used to treat depression, anxiety, anxiety disorders, obsessive compulsive disorders (ocd), manic-depressive Ò€¦