Alcohol can be consumed 7 days after cephalosporin injection, but due to different individual differences, the time of digestion and absorption of cephalosporins by the body is different, and the time when alcohol can be started may be delayed. Most cephalosporins can have a disulfiram-like reaction with alcohol, and such drugs can prevent the normal metabolism of alcohol. Cephalosporins can inhibit the secretion of acetaldehyde dehydrogenase, so that acetaldehyde, an intermediate product of ethanol, cannot be decomposed by acetaldehyde dehydrogenase, resulting in the accumulation of acetaldehyde in the body and symptoms of acetaldehyde poisoning. In mild cases, patients may experience nausea and vomiting, headache, chest tightness, flushing of the face, etc. In severe cases, respiratory distress and shock may occur, even leading to death. Therefore, patients must not drink alcohol while taking cephalosporins, which is not conducive to disease recovery. In addition, it should be noted that cephalosporins should not be used frequently for a long time during the illness.