Before you begin using GenVisc 850, tell your doctor:, If you have any allergies, About all the medications you take, including prescription and nonprescription medications, vitamins and herbal supplements., If you have any health conditions, If you are pregnant or plan to become pregnant, If you are breastfeeding or plan to breastfeed, Administer GenVisc 850 using a strict and sterile technique., Do not use GenVisc 850 with disinfectants that contain quaternary ammonium salts for the skin. This can cause the precipitation of sodium hyaluronate., After injecting GenVisc 850, joint pain and/or swelling may occur., You should avoid strenuous activity within at least 48 hours of injecting GenVisc 850., Store GenVisc 850 away from light at temperatures below 86°F (30° C). Do not store it in the freezer. If you have any allergies, About all the medications you take, including prescription and nonprescription medications, vitamins and herbal supplements., If you have any health conditions, If you are pregnant or plan to become pregnant, If you are breastfeeding or plan to breastfeed