Metaxalone

Metaxalone
Clinical data
Trade names	Skelaxin
AHFS/Drugs.com	Monograph
MedlinePlus	a682010
License data	US DailyMed: Metaxalone;
Routes of; administration	By mouth
ATC code	None;
Legal status
Legal status	US: ℞-only;
Pharmacokinetic data
Bioavailability	Unknown
Metabolism	Liver
Elimination half-life	9.2 ± 4.8 hours
Excretion	Kidney
Identifiers
	IUPAC name 5-[(3,5-dimethylphenoxy)methyl]-1,3-oxazolidin-2-one;
CAS Number	1665-48-1 ;
PubChem CID	15459;
IUPHAR/BPS	7609;
DrugBank	DB00660 ;
ChemSpider	14709 ;
UNII	1NMA9J598Y;
KEGG	D00773 ;
ChEMBL	ChEMBL1079604 ;
CompTox Dashboard (EPA)	DTXSID3023269 ;
ECHA InfoCard	100.015.253
Chemical and physical data
Formula	C12H15NO3
Molar mass	221.256 g·mol−1
3D model (JSmol)	Interactive image;
	SMILES O=C2OC(COc1cc(cc(c1)C)C)CN2;
	InChI InChI=1S/C12H15NO3/c1-8-3-9(2)5-10(4-8)15-7-11-6-13-12(14)16-11/h3-5,11H,6-7H2,1-2H3,(H,13,14) ; Key:IMWZZHHPURKASS-UHFFFAOYSA-N ;
	(verify)

Metaxalone, sold under the brand name Skelaxin, is a muscle relaxant medication 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 a moderately strong muscle relaxant, with relatively low incidence of side effects.

Common side effects include nausea, vomiting, drowsiness, and central nervous system (CNS) side effects, such as dizziness, headache, and irritability.

The metabolism of metaxalone involves enzymes CYP1A2 and CYP2C19 in the cytochrome P450 system. Because many medications are metabolized by enzymes in this system, precaution must be taken when administering it with other medications involving the P450 system to avoid interactions.

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

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