From Citizendium - Reading time: 1 min
In medicine, selective serotonin uptake inhibitors (SSRI) are second-generation antidepressants that potentiate the effect of serotonin by blocking its uptake from the synaptic cleft. These were the initial subgroup of the second generation, demonstrating generally improved side effects over the first-generation tricyclic antidepressants and monoamine oxidase inhibitors.
While SSRIs remain the group most often prescribed, both clinical response and side effects vary with individual patients. An atypical second-generation drug such as venlafaxine may induce faster and more reliable relief of depression, but also may have more side effects.[1]