After drinking beer it is recommended to take cephalosporins after 1 week. After drinking alcohol is rapidly absorbed by the stomach and small intestine, and then distributed in the blood and various tissues. The metabolism of alcohol is mainly carried out in the liver, mainly under the action of two enzymes, ethanol dehydrogenase and acetaldehyde dehydrogenase, which is much slower compared to the speed of its absorption. If you take cephalosporins after drinking alcohol, you are prone to disulfiram reaction, which can cause dizziness, nausea and other symptoms in mild cases, and can be life-threatening in severe cases. Alcohol in the human body completely metabolized time is about 24 ~ 48 hours, of course, this also depends on the amount of alcohol, drinker liver function is normal. If the amount of alcohol consumed is small and the drinker’s liver function is normal, then the alcohol in the body will be metabolized very quickly, about 24~48 hours; if the amount of alcohol consumed is large and/or the drinker’s liver function is abnormal, then the time for the complete metabolism of alcohol will be prolonged, and it may be as long as 3~4 days, or even 1 week. Therefore, it is recommended to take cephalosporins after 1 week of alcohol consumption and after the alcohol has been completely metabolized in the body to avoid adverse effects such as disulfiram reaction.