You cannot drink beer after it has expired. First of all, the taste of beer that has exceeded its shelf life will change first; secondly, expired beer contains a variety of acids, which are easily oxidized and aggregate with proteins, making the beer turbid and causing harmful bacteria such as E. coli and pathogenic bacteria to exceed the standard. After drinking expired beer, symptoms such as headache, diarrhea, vomiting, and even food poisoning are likely to occur. Other uses of expired beer: 1. It can keep flowers fresh. Because beer contains nutrients such as ethanol and sugar, adding a little beer to the flower arrangement container can extend the shelf life of flowers. 2. Soak dark clothes in water with some beer, which can soften the clothes and restore their original color. New clothes are less likely to change color after soaking. 3. Beer is slightly acidic and can adjust the pH of the soil, allowing acid-loving flowers to grow more lushly. Pour a small amount of beer directly into the pot. 4. Beer contains barley and hops. Washing your hair with beer can make your hair soft, shiny and dandruff-free. Before washing your hair with beer, you can wash your hair with shampoo, and then soak or rinse it with water added to the beer.