The vast majority of people in the clinic will not be allergic to lidocaine, but there are a very small number of people allergic to lidocaine, lidocaine allergy after the patient is mainly to the rash, itching, face red and swollen mainly. Overall, lidocaine allergy is relatively mild and does not cause severe asthma, breathing difficulties, or life-threatening symptoms. The overall incidence of lidocaine allergy is also relatively low, significantly lower than the incidence of clinical allergy to cephalosporins or penicillins. After the allergy caused by lidocaine, the main anti-allergy treatment, and at the same time, the next time to prohibit the use of lidocaine this kind of drug. Lidocaine is widely used in local anesthesia and analgesia, mainly to block the transmission of neurotransmitters, also has a certain therapeutic effect on arrhythmia, tachycardia and so on.