Chlorzoxazone

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 Muscol or Parafon Forte, a combination of chlorzoxazone and acetaminophen. Possible side effects include dizziness, lightheadedness, malaise, nausea, vomiting, and liver dysfunction.