Adequan i.m. Equine is a prescription intramuscular injectable medication used to manage arthritis and joint pain in horses. With Adequan i.m., you can diminish destructive joint disease by reversing the joint disease cycle, restoring joint lubrication and reducing inflammation to help keep joints moving and horses performing. Each 5 ml of Adequan i.m. Equine contains 500 mg of Polysulfated Glycosaminoglycan (PSGAG) solution. Includes 7 needles and syringes.