Ostenil is a solution containing hyaluronic acid. It is injected into the space in the joint that contains synovial fluid and works by restoring the normal balance between the breakdown and production of hyaluronic acid. The effect of Ostenil means that it can decrease pain and stiffness and improve the other symptoms of osteoarthritis.

The hyaluronic acid in Ostenil is very pure and is manufactured using a process called fermentation. It contains no animal products, which means it is very unlikely to cause an allergic reaction. Ostenil has been given to thousands of patients and has not been found to cause any serious side effects.