Mefpan Spas Tablet is a prescription drug that relieves menstruation pain and cramps. Mefpan Spas Tablet is a combination drug that relieves menstrual pain and cramps. It prevents abrupt muscle contractions (spasms) and blocks the release of chemical messengers that cause pain and inflammation, so relieving cramps, pain, bloating and discomfort. This medicine has no effect on the amount or duration of menstrual bleeding. Take this medication exactly as prescribed by your physician.