Diabetic patients can not inject insulin after drinking alcohol, because alcohol is metabolized by the liver in the body, and insulin is also metabolized by the liver to play a role, drinking alcohol may affect the insulin to play an effective role in lowering blood sugar, which is detrimental to the control of blood glucose, so diabetic patients in the use of insulin, or glucose-lowering drugs as far as possible, do not drink alcohol. Insulin is usually injected before meals to play a role in lowering blood sugar, diabetic patients should be injected with insulin before meals, but not after drinking alcohol to inject insulin, such a method is also incorrect.