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Concept
Serotonin–norepinephrine reuptake inhibitor
Summary
Serotonin–norepinephrine reuptake inhibitors (SNRIs) are a class of antidepressant medications used to treat major depressive disorder (MDD), anxiety disorders, obsessive–compulsive disorder (OCD), social phobia, attention-deficit hyperactivity disorder (ADHD), chronic neuropathic pain, fibromyalgia syndrome (FMS), and menopausal symptoms. SNRIs are monoamine reuptake inhibitors; specifically, they inhibit the reuptake of serotonin and norepinephrine. These neurotransmitters are thought to play an important role in mood regulation. SNRIs can be contrasted with the selective serotonin reuptake inhibitors (SSRIs) and norepinephrine reuptake inhibitors (NRIs), which act upon single neurotransmitters.
The human serotonin transporter (SERT) and noradrenaline transporter (NAT) are membrane transport proteins that are responsible for the reuptake of serotonin and noradrenaline from the synaptic cleft back into the presynaptic nerve terminal. Dual inhibition of serotonin and noradrenaline reuptake can offer advantages over other antidepressant drugs by treating a wider range of symptoms. They can be especially useful in concomitant chronic or neuropathic pain.
SNRIs, along with SSRIs and NRIs, are second-generation antidepressants. Since their introduction in the late 1980s, second-generation antidepressants have largely replaced first-generation antidepressants, such as tricyclic antidepressants (TCAs) and monoamine oxidase inhibitors (MAOIs), as the drugs of choice for the treatment of MDD due to their improved tolerability and safety profile.
There are eight FDA approved SNRIs in the United States, with venlafaxine being the first drug to be developed in 1993 and levomilnacipran being the latest drug to be developed in 2013. The drugs vary by their other medical uses, chemical structure, adverse effects, and efficacy.
Development and discovery of SSRI drugs
In 1952, iproniazid, an antimycobacterial agent, was discovered to have psychoactive properties while researched as a possible treatment for tuberculosis.
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