Tetrabenazine

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Tetrabenazine
Tetrabenazine.svg
Tetrabenazine3d.png
Clinical data
Trade namesXenazine, Xentra, Nitoman, others
SynonymsRo-1-9569
AHFS/Drugs.comConsumer Drug Information
Pregnancy
category
  • AU: B3
  • US: C (Risk not ruled out)
Routes of
administration
By mouth (tablets)
ATC code
Legal status
Legal status
Pharmacokinetic data
BioavailabilityLow, extensive first pass effect
Protein binding82–85%
MetabolismHepatic (CYP2D6-mediated)
ExcretionRenal (~75%) and fecal (7–16%)[1]
Identifiers
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard100.000.348 Edit this at Wikidata
Chemical and physical data
FormulaC19H27NO3
Molar mass317.427 g/mol g·mol−1
3D model (JSmol)
ChiralityRacemic mixture
  (verify)

Tetrabenazine is a drug for the symptomatic treatment of hyperkinetic movement disorders. It is sold under the brand names Nitoman and Xenazine among others. On August 15, 2008, the U.S. Food and Drug Administration approved the use of tetrabenazine to treat chorea associated with Huntington's disease. Although other drugs had been used "off label," tetrabenazine was the first approved treatment for Huntington's disease in the U.S.[2] The compound has been known since the 1950s.

Medical uses[edit]

Tetrabenazine is used as a treatment, but not as a cure, for hyperkinetic disorders such as:[3][4]

Side effects[edit]

The most common adverse reactions, which have occurred in at least 10% of subjects in studies and at least 5% greater than in subjects who received placebo, have been: sedation or somnolence, fatigue, insomnia, depression, suicidal thoughts, akathisia, anxiety and nausea.[1]

Warnings[edit]

There is a boxed warning associated with the use of tetrabenazine:[1]

  • Increases the risk of depression and suicidal thoughts and behavior in patients with Huntington's disease
  • Balance risks of depression and suicidality with the clinical need for control of chorea when considering the use of tetrabenazine
  • Monitor patients for emergence or worsening of depression, suicidality or unusual changes in behavior
  • Inform patients, caregivers and families of the risk of depression and suicidality and instruct to report behaviours of concern promptly to the treating physician
  • Exercise caution when treating patients with a history of depression or prior suicide attempts or ideation
  • Tetrabenazine is contraindicated in patients who are actively suicidal and in patients with untreated or inadequately treated depression

Pharmacology[edit]

The precise mechanism of action of tetrabenazine is unknown. Its anti-chorea effect is believed to be due to a reversible depletion of monoamines such as dopamine, serotonin, norepinephrine, and histamine from nerve terminals. Tetrabenazine reversibly inhibits vesicular monoamine transporter 2, resulting in decreased uptake of monoamines into synaptic vesicles, as well as depletion of monoamine storage.[1]

See also[edit]

References[edit]

  1. ^ a b c d "Xenazine (tetrabenazine) Tablets, for Oral Use. Full Prescribing Information. Revised: 6/2015" (PDF). H. Lundbeck A/S. Retrieved 9 December 2015.
  2. ^ 1st US drug for Huntington's disease wins approval[dead link]
  3. ^ Jankovic J, Beach J (1997). "Long-term effects of tetrabenazine in hyperkinetic movement disorders". Neurology. 48 (2): 358–62. doi:10.1212/wnl.48.2.358. PMID 9040721.
  4. ^ Kenney C, Hunter C, Jankovic J (January 2007). "Long-term tolerability of tetrabenazine in the treatment of hyperkinetic movement disorders". Movement Disorders. 22 (2): 193–7. doi:10.1002/mds.21222. PMID 17133512.
  5. ^ Ondo WG, Hanna PA, Jankovic J (August 1999). "Tetrabenazine treatment for tardive dyskinesia: assessment by randomized videotape protocol". American Journal of Psychiatry. 156 (8): 1279–81. doi:10.1176/ajp.156.8.1279 (inactive 2019-08-20). PMID 10450276.

External links[edit]