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Tetrabenazine : ウィキペディア英語版 | Tetrabenazine
Tetrabenazine is a drug for the symptomatic treatment of hyperkinetic movement disorder and is marketed under the trade names Nitoman in Canada and Xenazine in New Zealand and some parts of Europe, and is also available in the USA as an orphan drug. On August 15, 2008 the U.S. Food and Drug Administration (FDA) approved the use of tetrabenazine to treat chorea associated with Huntington's disease (HD), the first in the US.〔(1st US drug for Huntington's disease wins approval )〕 The compound has been known since the 1950s. ==Pharmacology== The precise mechanism of action of tetrabenazine is unknown. The antichorea effect is believed to be related to its effect as a reversible depletory of monoamines (such as dopamine, serotonin, norepinephrine and histamine)from nerve terminals) Tetrabenazine reversibly inhibits VMAT-2 resulting in decreased of monamines into synaptic vesicles (Xenazine prescribing information )
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