Drinking alcohol in a diabetic patient may raise blood sugar and may also lower it, leading to severe hypoglycemia, among other things. 1. Drinking alcohol in diabetic patients can lead to an increase in blood glucose because of the presence of calories in alcohol itself, and an increase in blood glucose levels can occur after drinking alcohol. 2. Drinking alcohol is extremely unfriendly to diabetic patients, especially while taking hypoglycemic medication. When a small amount of alcohol is consumed several times, it will cause an increase in the secretion of drug enzymes, and the metabolism of hypoglycemic drugs will be accelerated, which is not effective in lowering blood sugar. If patients drink a lot of alcohol, the activity of drug enzymes in the liver will be inhibited, so that insulin and hypoglycemic drugs to enhance the effect, causing severe hypoglycemia or even death. 3. Acetaldehyde is an intermediate product of alcohol, and hypoglycemic drugs can inhibit the decomposition of acetaldehyde. If the concentration of acetaldehyde in the blood increases, it can lead to toxic reactions, i.e., shortness of breath, drop in blood pressure, nausea, vomiting, and so on. For diabetic patients, it is not recommended to drink alcohol, and at the same time, diabetic patients need to be under the guidance of a doctor to eat and treat reasonably.