Methocarbamol has not been shown to be any more effective than painkillers...
Methocarbamol was first sold in the United States in July 1957. The drug is FDA-approved to be used with rest, physical therapy, and other measures for the relief of discomfort associated with acute, painful musculoskeletal conditions. The way methocarbamol works has not been clearly identified but may be related to its sedative properties. Methocarbamol does not directly relax tense skeletal muscles in people.
Methocarbamol has not been shown to be any more effective than painkillers or anti-inflammatory drugs such as aspirin for relieving the pain of local muscle spasm.
Methocarbamol’s side effects include drowsiness, lightheadedness, dizziness, nausea, vomiting, heartburn, abdominal distress, constipation, diarrhea, and loss of appetite.
Since methocarbamol possesses a central nervous system (CNS) depressant effect, patients must be careful about the combined effects when the drug is used with alcohol and other CNS depressants.