A serotonin releasing agent (SRA) is a type of drug that induces the release of serotonin into the neuronal synaptic cleft. A selective serotonin releasing agent (SSRA) is an SRA with less significant or no efficacy in producing neurotransmitter efflux at other types of monoamine neurons, including dopamine and norepinephrine neurons.[1]
SRAs, for instance fenfluramine, dexfenfluramine, and chlorphentermine, have been used clinically as appetite suppressants.[2][3] However, these SRAs were withdrawn from the market due to toxicity in the 1990s and no SRAs were available or employable for clinical study for many years.[2][3][4] In any case, a low-dose formulation was reintroduced for treatment of Dravet syndrome in 2020 and this allowed clinical and research use of SRAs in humans once again.[5]
Aside from use as appetite suppressants, SSRAs have been proposed as novel antidepressants and anxiolytics, with the potential for a faster onset of action and superior effectiveness relative to the selective serotonin reuptake inhibitors (SSRIs).[6][7]
A closely related type of drug is a serotonin reuptake inhibitor (SRI), for instance fluoxetine.
Marona-LewickaNichols1994
was invoked but never defined (see the help page).RothmanBaumann2006
was invoked but never defined (see the help page).RothmanBaumann2003
was invoked but never defined (see the help page).Until recently, it has been challenging to characterise the effects of SSRAs in humans because of the lack of available licensed pharmacological probes. However, in 2020, low dose fenfluramine (up to 26 mg daily; racemic mixture) was licensed for the treatment of Dravet epilepsy41.
ScorzaSilveiraNichols1999
was invoked but never defined (see the help page).