Naproxen 500 mg is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve symptoms of arthritis, such as osteoarthritis, rheumatoid arthritis, or juvenile arthritis. It is also used to reduce pain, swelling, and joint stiffness caused by conditions like bursitis, gout attacks, and menstrual pain. Naproxen works by stopping the bodys production of a substance that causes pain, fever, and inflammation. It is available in various forms, including tablets and liquid, and should be taken with or just after a meal or snack. The most common side effects of naproxen include confusion, headache, ringing in the ears, changes in vision, tiredness, drowsiness, dizziness, and rashes. It is important to take the lowest dose of naproxen for the shortest time to control symptoms and to seek medical advice if there are any serious drug reactions or signs of a heart attack or stroke.