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Antidepressants such as Selective Serotonin Reuptake Inhibitors (SSRI) act as indirect agonists of serotonin (5-HT) receptors. Although these drugs produce a rapid blockade of serotonin transporters (SERTs) in vitro, several weeks of treatment are necessary to observe clinical benefits. This paradox has not been solved yet. Recent studies have identified modifications of intracellular signaling proteins...
Whereas SSRIs produce rapid blockade of the serotonin transporter (SERT) in vitro and in vivo, the onset of an observable clinical effect takes longer to occur and a variety of pharmacological effects caused by antidepressants have been speculated to be involved either in initiating antidepressant effects and/or enhancing their effects on serotonergic transmission so as to cause clinical improvement...
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