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Naproxen is a nonsteroidal anti-inflammatory drug (NSAID) that is used to relieve pain and inflammation. Naproxen is used to treat various conditions, such as headaches, muscle aches, arthritis, menstrual cramps, and tendinitis. It can also be used to reduce fever and is available as an over-the-counter (OTC) medication and as a prescription drug.
Naproxen works by blocking the action of chemicals in the body called cyclo-oxygenase (COX) enzymes. These enzymes help to produce other chemicals called prostaglandins, a type of chemical that causes pain and inflammation when produced at damaged or injured areas of the body. Naproxen's inhibition of COX enzyme activity reduces the amount of prostaglandin produced, thus relieving the body of any symptoms.