Question: what classes of drugs are used to treat depression?
Answer: Selective serotonin reuptake inhibitors (SSRIs). ... 
Serotonin and norepinephrine reuptake inhibitors (SNRIs). ... 
Atypical antidepressants. ... 
Tricyclic antidepressants. ... 
Monoamine oxidase inhibitors (MAOIs). ... 
Other medications.