World Library  
Flag as Inappropriate
Email this Article

Metaxalone

Article Id: WHEBN0003127074
Reproduction Date:

Title: Metaxalone  
Author: World Heritage Encyclopedia
Language: English
Subject: Muscle relaxant, Carisoprodol, C12H15NO3, Antispasmodic, Muscle relaxants
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Metaxalone

Metaxalone
Systematic (IUPAC) name
5-[(3,5-dimethylphenoxy)methyl]-1,3-oxazolidin-2-one
Clinical data
Trade names Skelaxin
AHFS/Drugs.com
MedlinePlus
Pregnancy
category
  • US: C (Risk not ruled out)
Legal status
Routes of
administration
Oral
Pharmacokinetic data
Bioavailability Unknown
Metabolism Hepatic
Biological half-life 9.2 (± 4.8) hours
Excretion Renal
Identifiers
CAS Registry Number  YesY
ATC code None
PubChem CID:
IUPHAR/BPS
DrugBank  YesY
ChemSpider  YesY
UNII  YesY
KEGG  YesY
ChEMBL  YesY
Chemical data
Formula C12H15NO3
Molecular mass
Documentation

 YesY   
Not to be confused with Metolazone, a diuretic.

Metaxalone (marketed by King Pharmaceuticals under the brand name Skelaxin) is a muscle relaxant used to relax muscles and relieve pain caused by strains, sprains, and other musculoskeletal conditions. Its exact mechanism of action is not known, but it may be due to general central nervous system depression. It is considered to be a moderately strong muscle relaxant, with relatively low incidence of side effects. Skelaxin is available in an 800 mg scored tablet. Possible side effects include nausea, vomiting, drowsiness and CNS side effects, such as dizziness, headache, and irritability.

Metaxalone exhibits increased bioavailability when taken with food.[1] Specifically, in one study, compared to fasted conditions, the presence of food at the time of drug administration increased Cmax by 77.5%, AUC0-t by 23.5%, and AUC0-∞ by 15.4%.[2] Thus, based on the information in the labeling, patients receiving metaxalone therapy are directed to take metaxalone with food, and are informed that taking metaxalone with food results in an increase in the oral bioavailability of metaxalone compared to taking metaxalone without food.[3][4][5]

The metabolism of metaxalone involves the liver cytochrome P450 system. Based on the information in the labeling, patients receiving metaxalone therapy and physicians prescribing metaxalone are directed to take precaution when coadministering it with other medications involving the P450 system.[6][7]

Because of potential for side effects, this drug is on the list for high risk medications in the elderly.

Assay

A literature survey reveals very few methods are reported for the determination of metaxalone to date. Nirogi et al.[2] reported a liquid chromatographic method coupled to tandem mass spectrometry for the quantification of metaxalone in human plasma. A stability-indicating HPLC method was introduced by P.K. Sahu et al.[8] Metaxalone has been used as an internal standard for few analytical methods[9][10]

References

  1. ^ Skelaxin Package Insert
  2. ^ a b
  3. ^ id.
  4. ^ United States Patent No. 6,407,128
  5. ^ United States Patent No. 6,683,102
  6. ^ United States Patent No. 7,122,566, by Jie Du, et al
  7. ^ United States Patent No. 7,378,434, by Jie Du, et al
  8. ^ Prafulla Kumar Sahu, M. Mathrusri Annapurna and Dillip Kumar Sahoo, Development and Validation of Stability Indicating RP-HPLC Method for the Determination of Metaxalone in Bulk and its Pharmaceutical Formulations; E-Journal of Chemistry, 2011, 8(S1), S439-S447.[1]
  9. ^ Mistri H N, Jangid A G, Pudage A, Gomes N, Sanyal M and Shrivastav P, J Chromatogr B, 2007, 853(1), 320-332.
  10. ^ Mistri H N, Jangid A G, Pudage A and Shrivastav P, J Chromatogr B, 2008, 864(1-2), 137-148.

External links

  • Skelaxin (manufacturer's website)
This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.