Naproxen is banned because of its side effects and great harm to the body. Naproxen is a non-steroidal anti-inflammatory drug with anti-inflammatory, detumescence and analgesic effects. However, its side effects can cause allergic reaction, nausea, vomiting, headache, dizziness, tinnitus and other symptoms, which are harmful to liver and kidney function. Naproxen on the market is banned.