The main ingredient of topical prolongation sprays is lidocaine, which generally has no side effects, and some patients may have allergies, rashes, itching and other side effects. At present, the topical prolongation spray has lidocaine aerosol, which can play a local anesthetic effect on the skin and mucous membranes, thus reducing penile sensitivity, and play the role of prolonging sexual life. Patients using drugs need to combine their own situation, ask the doctor’s guidance. Generally, if the patient is used within the prescribed dosage range, there will be no adverse reactions. However, due to the variability of personal constitution, some patients are relatively sensitive, there may be allergic reactions, after the use of skin redness, swelling, small pimples, itching and other adverse reactions may occur. Therefore, those who are allergic to the ingredients of lidocaine need to contraindicate the use of this drug. Patients in the period of external use of prolongation spray, once the body abnormal discomfort, should promptly consult a doctor, and ask the doctor’s guidance.