A serotonin–norepinephrine releasing agent (SNRA) is a type of drug which induces the release of serotonin and norepinephrine (and epinephrine) in the body and/or brain.
Only a few SNRAs are known, examples of which include norfenfluramine and MBDB. Fenfluramine/phentermine (Fen-Phen), a combination formulation of fenfluramine, a serotonin releasing agent, and phentermine, a norepinephrine releasing agent, is a functional SNRA that was formerly used as an appetite suppressant for the treatment of obesity.
A closely related type of drug is a serotonin–norepinephrine reuptake inhibitor (SNRI).
Original source: https://en.wikipedia.org/wiki/Serotonin–norepinephrine releasing agent.
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