Allergies caused by penicillin are very likely to be life-threatening if the degree of allergy is severe and anaphylaxis occurs or is not treated in time, that is, it is likely to be fatal. However, for most penicillin allergies, the symptoms that usually begin to appear are chest tightness, rash or fever. If the degree of allergy is not severe, the patient’s life can be saved with appropriate resuscitation and medication. However, for some people who are particularly sensitive or even allergic, penicillin allergy is likely to come on fiercely and may take a person’s life within minutes, so it is likely that resuscitation is not timely. Therefore, when injecting penicillin or cephalosporin, it is recommended to try to be in a more formal and resuscitation capable medical unit, otherwise there is a risk of death without timely resuscitation.