Mefenamic Acid is used for:

Treating menstrual pain. It may be used for short term (not more than 7 days) treatment of mild to moderate pain. It may also be used for other conditions as determined by your doctor.

Mefenamic Acid is an NSAID. Exactly how it works is not known. It may block certain substances in the body that are linked to inflammation. NSAIDs treat the symptoms of pain and inflammation. They do not treat the disease that causes those symptoms...