Delay spray should refer to the delay spray, its role is to reduce the sensitivity of the glans, prolong the sex life time. At present, the clinical use of delay spray generally contain surface anesthetic components, such as lidocaine, bupivacaine, etc., the use of evenly sprayed on the surface of the glans penis, through the skin penetration of the subcutaneous nerves can produce a paralytic effect, thereby delaying or blocking nerve conduction, so that the glans sensitivity is reduced, prolonged sex life, clinically used for premature ejaculation caused by excessive sensitivity of the glans patients. Delay spray is generally used 30 minutes before sex, after using the drug it is best to wash the drug before intercourse or wear a condom, otherwise it may cause vaginal nerve paralysis, the lack of female pleasure. The use of delay spray also has certain adverse reactions, the most common is the allergic reaction, can appear local itching, rash, need to stop using the drug immediately, and wash the residual drug. When used in excess, it may lead to excessive numbness of the glans, lack of sexual pleasure, may also have difficulty in ejaculation, or even erectile dysfunction. Delay spray is best used under the guidance of a specialist to avoid adverse consequences.