What are the four classes of anti depressants?

SSRIs (e.g. fluoxetine or citalopram), SNRIs serotonin and noradrenaline reuptake inhibitors (e.g. venlafaxine ) TCA tricyclic antidepressants (e.g. amitriptyline) and  Monoamine oxidase inhibitors (MAOIs) (phenelzine)