<Tr> <Td_colspan="2"> In Wikidata </Td> </Tr> <P> Selective serotonin reuptake inhibitors (SSRIs) are a class of drugs that are typically used as antidepressants in the treatment of major depressive disorder and anxiety disorders . </P> <P> The exact mechanism of action of SSRIs is unknown . SSRIs are believed to increase the extracellular level of the neurotransmitter serotonin by limiting its reabsorption (reuptake) into the presynaptic cell, increasing the level of serotonin in the synaptic cleft available to bind to the postsynaptic receptor . They have varying degrees of selectivity for the other monoamine transporters, with pure SSRIs having only weak affinity for the norepinephrine and dopamine transporters . </P> <P> SSRIs are the most widely prescribed antidepressants in many countries . The efficacy of SSRIs in mild or moderate cases of depression has been disputed, and may be outweighed by side effects . </P>

An ssri medication such as prozac inhibits (blocks) the process known as
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