Dexcom G4 PLATINUM Continuous Glucose Monitoring System The Dexcom G4 PLATINUM Continuous Glucose Monitoring System is a glucose monitoring device indicated for detecting trends and tracking patterns in persons (age 18 and older) with diabetes.

The company identified potential interference from hydroxyurea. Patient use of the anti-neoplastic drug may falsely elevate glucose readings on the Continuous Glucose Monitoring Systems.

Starting in February 2020, the firm will add an "URGENT MEDICAL DEVICE CORRECTION" Notification to sensor packaging informing valued customers that the firm recently became aware that hydroxyurea, an anti-neoplastic drug used primarily in chemotherapy, falsely elevates glucose readings on its Continuous Glucose Monitoring (CGM) Systems. This may result in failure to treat hypoglycemia from missed low sensor glucose values and alerts or by causing other errors in diabetes management decisions (for example, hypoglycemia resulting from an insulin dose based on a falsely elevated sensor glucose reading). Some examples of the disease states that hydroxyurea is more commonly used in include: -Chronic Myelogenous Leukemia (CML) -Head and neck malignancies, and -Sickle cell disease The Recalling Firm is instructing its customers to not use their CGM System for diabetes treatment decisions if they are taking hydroxyurea. Customers are instructed to talk to their physician about alternative glucose monitoring approaches, and if they are unsure if they have been prescribed hydroxyurea. The Recalling Firm is currently updating their product labelling as following: "Hydroxyurea is a medication used in the treatment of diseases including cancer and sickle cell anemia; it is known to interfere with readings from your sensor. If you are taking hydroxyurea, your sensor glucose readings will be higher than your actual glucose, which could result in missed hypoglycemia alerts, or errors in diabetes management, such as giving yourself a higher dose of insulin due to falsely high sensor glucose values. The level of inaccuracy depends on the amount of hydroxyurea in your body. Do not use your Dexcom CGM System for diabetes treatment decisions if you are taking hydroxyurea. Talk to your physician about alternative glucose monitoring approaches. . . .Should you have any questions regarding hydroxyurea or alternative glucose monitoring approaches, please contact your healthcare