Hyalgan Injection is a medicine used in the treatment of osteoarthritis of the knee in patients who have failed to respond adequately to conservative therapy and simple analgesics. It reduces the swelling and stiffness in the joints and improve joint function. Hyalgan Injection is generally administered by a doctor or a nurse. You should not self-administer this medicine at home. The dosage will depend on the the age, weight, and clinical condition of the patient as well as laboratory determinations. Get the injection for as long as the doctor has prescribed even if you get better until that doctor tells you it is alright to stop.Common side effects of this medicine include injection site reactions (such as swelling, pain, and redness), joint swelling, and pain in the joints. If the side effects get worse or bother you, or if you experience any other symptoms which you think are caused by this medicine, let your doctor know. Your doctor may help with ways to reduce or prevent these symptoms.To make sure the medicine is safe for you, let your doctor know of all the other medicines you are taking before using this medicine. If you are pregnant or breastfeeding, you should consult your doctor first before taking this medicine.