NHS information about naproxen, including what it's used for, who can take it, how to take it and side effects. Learn how naproxen 500 mg works, what conditions it treats, how long it takes to kick in, and what side effects and risks to be aware of. Naproxen 500 mg is a prescription-strength nonsteroidal anti-inflammatory drug (NSAID) used to treat pain, inflammation, and stiffness caused by conditions like arthritis, gout, menstrual cramps, tendinitis, and headaches including migraine. Learn about side effects, dosage, uses, and more for naproxen, which is a generic prescription oral tablet that treats many conditions, such as arthritis. Naproxen is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve symptoms of arthritis (eg, osteoarthritis, rheumatoid arthritis, or juvenile arthritis) such as inflammation, swelling, stiffness, and joint pain. Naproxen 500 mg is a prescription-strength anti-inflammatory medication used to treat pain, swelling, and stiffness from conditions like arthritis, gout flare-ups, tendinitis, bursitis, and menstrual cramps. Naproxen is used to treat a variety of inflammatory conditions and symptoms that are due to excessive inflammation, such as pain and fever (naproxen has fever-reducing, or antipyretic, properties in addition to its anti-inflammatory activity). [10] Naproxen is a nonsteroidal anti-inflammatory drug (NSAID). It works by reducing hormones that cause inflammation and pain in the body. Naproxen is used to treat pain or inflammation caused by conditions such as arthritis, ankylosing spondylitis, tendinitis, bursitis, gout, or menstrual cramps. Overview: Naproxen is a nonsteroidal anti-inflammatory drug (NSAID) used to relieve pain, reduce swelling, and lower fever. Common side effects include belly pain, upset stomach, heartburn, or. What is Naprelan 500? Naprelan 500 is a nonsteroidal anti-inflammatory drug (NSAID). Naprelan 500 is used to treat pain or inflammation caused by conditions such as arthritis, ankylosing spondylitis, tendinitis, bursitis, gout, or menstrual cramps.