Tolmetin is the generic name for Tolectin DS and Tolectin 600. It belongs to a class of drugs known as nonsteroidal anti-inflammatory agents. Tolmetin is used for treating rheumatoid arthritis, osteoarthritis or juvenile arthritis. Tolmetin may also be prescribed for other conditions as determined by the patient's physician. Tolmetin is an NSAID drug that functions by blocking certain substances in the body that are linked to inflammation.