The liver acts as the body’s glucose (of fuel) storage, and helps to control the glucose levels in the blood by storing and releasing glucose depending upon the body’s need and in response to hormones insulin and glucagon.
When you drink alcohol, it impacts the liver: your body tries to eradicate this toxic substance as soon as possible, through the liver, and this process interferes with the liver’s normal ability to release glucose into the blood.
Alcohol can sometimes trick us. A number of alcoholic drinks (such as beers, cider and liquers) contain carbohydrate and they may cause our blood sugar levels to rise initially, however a the blood sugar levels may drop once the liver is activated to get rid of the alcohol and glucose release into the blood is impaired.
So even while you (in some cases) see your blood sugar levels drop when consuming alcohol, it is still something that is causing harm to your body, and is not advised to consume in excess.