See also Warning section. Mefenamic acid is used for the short-term relief of mild to moderate pain from various conditions such as headache, dental pain, menstrual cramps, and muscle aches. Mefenamic acid is known as a nonsteroidal anti-inflammatory drug (NSAID). It works by blocking your body's production of certain natural substances that cause inflammation. This effect helps to decrease swelling, pain, or fever. View More Info

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