Naproxen is a nonsteroidal anti-inflammatory drug (NSAID) commonly used to relieve pain, reduce inflammation, and lower fever. It is often prescribed for conditions such as Arthritis, menstrual cramps, and other types of acute pain. Naproxen works by inhibiting enzymes involved in the production of prostaglandins, which are substances that mediate inflammation and pain. It is available in both prescription and over-the-counter forms.