There are different types of antidepressant , called monoamine oxidase inhibitors ( MAOIs ) , tricyclic antidepressants ( TCAs ) , tetracyclic antidepressants ( TeCAs ) , selective serotonin reuptake inhibitors ( SSRIs ) and serotonin-norepinephrine reuptake inhibitors ( SNRIs ) . Drugs including the monoamine oxidase inhibitors ( MAOIs ) , tricyclic antidepressants ( TCAs ) , tetracyclic antidepressants ( TeCAs ) , selective serotonin reuptake inhibitors ( SSRIs ) , and serotonin-norepinephrine reuptake inhibitors ( SNRIs ) are most commonly associated with the term .