MIGREX 200 MG is a tablet containing 200 milligrams of tolfenamic acid. 1 Tolfenamic acid is a non-steroidal anti-inflammatory drug (NSAID) that is used to relieve mild to moderate pain, inflammation, and fever. 2 It is often prescribed for conditions such as muscle aches, joint pain, menstrual cramps, and headaches. Like other NSAIDs, it works by inhibiting the production of prostaglandins, substances in the body that cause pain, fever, and inflammation. 3