The<unk> s are a class of antidepressants characterized primarily by the era of their introduction, approximately coinciding with the 1970s and 1980s, rather than by their chemical structure or by their pharmacological effect. As a consequence, there is some controversy over which treatments actually belong in this class. The term "third<unk>  antidepressant" is sometimes used to refer to newer antidepressants, from the 1990s and 2000s, often selective serotonin reuptake inhibitors (SSRIs) such as; fluoxetine (Prozac), paroxetine (Paxil) and sertraline (Zoloft), as well as some non-SSRI antidepressants such as mirtazapine, nefazodone, venlafaxine, duloxetine and reboxetine. However, this usage is not universal.
Second-generation antidepressant
Tricyclic antidepressant
Tetracyclic antidepressant
Atypical antidepressant
Heterocyclic antidepressant
Antipsychotic ester
Typical antipsychotic
Atypical antipsychotic