Hormonal drugs such as glucocorticoids and thyroid hormones may cause high blood sugar. The normal fasting blood glucose range is 3.9~6.1mmol/L. Fasting blood glucose above the normal range suggests elevated blood glucose levels. In addition to certain diseases, such as type 1 diabetes, type 2 diabetes, infections, and other diseases that can lead to elevated blood glucose, some medications may also elevate blood glucose. Common drugs that can cause high blood sugar include: glucocorticoid drugs such as prednisone, which can antagonize the action of insulin and thus raise blood sugar; thyroid hormones, which can promote gluconeogenesis and break down hepatic glycogen into glucose, thus leading to high blood sugar. There are many drugs that can lead to high blood sugar, it is recommended that diabetic patients follow the doctor’s instructions when choosing drugs, blind use is risky, if you find that taking the drug leads to high blood sugar, you should immediately seek medical attention, by a professional doctor to assess whether to stop or replace the drug.