Chlorzoxazone is a centrally acting muscle relaxant used to treat muscle spasm and the resulting pain or discomfort. This chemical is a kind of bulk pharmaceutical chemical. There are some basic informations about this crude drug: (1)CAS No.: ; (2)ATC code: M03BB03; (3)PubChem: CID 2733; (4)DrugBank: APRD00308; (5)ChemSpider: 2632; (6)Formula: C₇H₄ClNO₂; (7)Mol. mass: 169.565 g/mol.

Chlorzoxazone acts on the spinal cord by depressing reflexes. It is sold as Muscol or Parafon Forte, a combination of chlorzoxazone and acetaminophen (). Possible side effects include dizziness, lightheadedness, malaise, nausea, vomiting, and liver dysfunction. Used with acetaminophen it has added risk of hepatoxicity, which is why the combination is not recommended.