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Systematic (IUPAC) name
CAS number 95-25-0
ATC code M03BB03
PubChem 2733
DrugBank APRD00308
Chemical data
Formula C7H4ClNO2 
Mol. mass 169.565 g/mol
Pharmacokinetic data
Bioavailability well absorbed
Protein binding 13–18%
Metabolism hepatic
Half life 1.1 hr
Excretion urine (<1%)
Therapeutic considerations
Pregnancy cat.


Legal status
Routes oral

Chlorzoxazone is a centrally acting muscle relaxant used to treat muscle spasm and the resulting pain or discomfort. It acts on the spinal cord by depressing reflexes. It is sold as Parafon Forte, a combination of chlorzoxazone and acetaminophen. Possible side effects include dizziness, lightheadedness, malaise, nausea, vomiting, and liver dysfunction.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Chlorzoxazone". A list of authors is available in Wikipedia.
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