Is it okay to drink beer 4 hours after taking cephalosporin?

No.
The interaction of cephalosporins with alcohol in the body can produce a “disulfiram” reaction. During the treatment of cephalosporins and within a week of stopping the drug should be prohibited from drinking alcohol, so take cephalosporin 4 hours can not drink beer.
“Disulfiram”-like reaction of the respiratory system can be manifested as chest tightness and shortness of breath, cyanosis, laryngeal edema, dyspnea, etc.; for the cardiovascular system, there will be a rapid increase in heart rate, blood pressure drop and even anaphylactic shock; in addition, there will also be a flushed face, nausea and vomiting, weakness of the limbs, cold sweat, insomnia, headache, blurred vision, hallucinations, hallucinations and trance, accompanied by loss of consciousness. And accompanied by loss of consciousness and other manifestations.
If you drink alcohol after taking cephalosporin, you should go to the hospital immediately, and the doctor will make a diagnosis and treatment plan, so as not to delay the condition.