PONSTAN contains the active ingredient mefenamic acid. PONSTAN belongs to a group of medicines called Non-Steroidal Anti-Inflammatory Drugs (or NSAIDs). PONSTAN relieves pain and reduces inflammation (swelling, redness and soreness) that may occur in the following: menstrual cramps (period pain) muscle and bone injuries such as sprains, strains, low back pain (lumbago), rheumatism and tendonitis after setting broken or dislocated bones dental pain headache