Naprosyn is a potent non-steroidal anti-inflammatory agent. Naprosyn is often used to treat patients with rheumatoid arthritis. Naprosyn reduces joint swelling, stiffness, and pain in many patients. Naprosyn is also used to treat tendonitis and injuries seen commonly with weight training athletes. Naprosyn works by preventing the production of a certain hormone called prostaglandin. It is not degenerative like corticosteroids are, but it works equally as well in most patients. It has proven to be effective in relieving the joint pain a lot of lifters experience while training. Unfortunately Naprosyn can cause serious stomach problems including bleeding ulcers. Many users report stomach pain after taking Naprosyn. This seems to be less severe if the dose is taken with a large meal. Any person who has suffered any type of stomach ulcer is advised to stay away from Naprosyn. Naprosyn recommended dosage is 500mg daily and should not be exceeded. Duration of use should be from seven to 14 days, no longer. Other anti-inflammatories, which are very similar to Naprosyn, are Tolectin and Ibuprofen (Motrin). These drugs are usually attained from a physician.