Synvisc Hylan GF 20mg Injection is a medicine used in the treatment of osteoarthritis. It decreases the pain and swelling in the joints. It may be used alone or in combination with other medicines. Synvisc Hylan GF 20mg Injection is given by a healthcare professional. You should not self-administer this medicine at home. Use it regularly and do not stop taking the medicine even if you get better until that doctor tells you it is alright to stop. The medicine is generally well tolerated with little or no side effects. It may cause pain, redness, and pain at the site of injection in some people. However, if you experience any symptoms which you think are due to the use of this medicine, you should 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.