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SNRIs : ウィキペディア英語版
Serotonin–norepinephrine reuptake inhibitor
Serotonin–norepinephrine reuptake inhibitors (SNRIs), also known as serotonin-noradrenaline reuptake inhibitors, are a class of antidepressant drugs used in the treatment of major depressive disorder (MDD) and other mood disorders. They are sometimes also used to treat anxiety disorders, obsessive-compulsive disorder (OCD), attention deficit hyperactivity disorder (ADHD), chronic neuropathic pain, and fibromyalgia syndrome (FMS), and for the relief of menopausal symptoms.
SNRIs are potent inhibitors of the reuptake of serotonin and norepinephrine. These neurotransmitters are known to play an important role in mood. SNRIs can be contrasted with the more widely used selective serotonin reuptake inhibitors (SSRIs), which act upon serotonin alone.
The human serotonin transporter (SERT) and norepinephrine transporter (NET) are membrane proteins that are responsible for the reuptake of serotonin and norepinephrine. Balanced dual inhibition of monoamine reuptake can possibly offer advantages over other antidepressants drugs by treating a wider range of symptoms.
SNRIs, along with selective serotonin reuptake inhibitors (SSRIs) and norepinephrine reuptake inhibitors (NRIs), are second-generation antidepressants. Over the past two decades, second-generation antidepressants have gradually replaced first-generation antidepressants, such as tricyclic antidepressants (TCAs) and monoamine oxidase inhibitors (MAOIs) as the drugs of choice for the treatment of MDD. This is mainly because of their improved tolerability and safety profile.
== Types ==

* Venlafaxine (Effexor) – The first and most commonly used SNRI. It was introduced by Wyeth in 1994. The reuptake effects of venlafaxine are dose-dependent. At low doses (<150 mg/day), it acts only on serotonergic transmission. At moderate doses (>150 mg/day), it acts on serotonergic and noradrenergic systems, whereas at high doses (>300 mg/day), it also affects dopaminergic neurotransmission.
* Desvenlafaxine (Pristiq) – The active metabolite of venlafaxine. It is believed to work in a similar manner, though some evidence suggests lower response rates compared to venlafaxine and duloxetine. It was introduced by Wyeth in May 2008 and was then the third approved SNRI.
* Duloxetine (Cymbalta, Yentreve) – By Eli Lilly and Company, has been approved for the treatment of depression and neuropathic pain in August 2004. Duloxetine is contraindicated in patients with heavy alcohol use or chronic liver disease, as duloxetine can increase the levels of certain liver enzymes that can lead to acute hepatitis or other diseases in certain at risk patients. Currently, the risk of liver damage appears to be only for patients already at risk, unlike the antidepressant nefazodone, which, though rare, can spontaneously cause liver failure in healthy patients.〔(Rxlist.com: "Nefazodone Prescribing Information" ), accessed 24 May 2012.]〕 Duloxetine is also approved for major depressive disorder (MDD), generalized anxiety disorder (GAD), diabetic neuropathy, chronic musculoskeletal pain, including chronic osteoarthritis pain and chronic low back pain (as of October, 2010), and is one of the only three medicines approved by the FDA for fibromyalgia ().
* Milnacipran (Dalcipran, Ixel, Savella) – Shown to be significantly effective in the treatment of depression and fibromyalgia. The Food and Drug Administration (FDA) approved milnacipran for treatment of fibromyalgia in the United States of America in January 2009, however it is currently not approved for depression in that country. Milnacipran has been commercially available in Europe and Asia for several years.
* Levomilnacipran (Fetzima) – The levo- isomer of milnacipran. Under development for the treatment of depression in the United States and Canada, it was approved by the FDA for treatment of MDD in July 2013.
* Sibutramine (Meridia, Reductil) – An SNRI, which, instead of being developed for the treatment of depression, was widely marketed as an appetite suppressant for weight loss purposes. Sibutramine was the first drug for the treatment of obesity to be approved in 30 years.

''5-HT: Serotonin - NE: Norepinephrine - D: Dopamine - NA: Not available''

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