Lidocaine hydrochloride gel paste needs to be applied to the outer wall of the esophagus, pharynx, trachea, urethra and other catheters for use, and can be applied directly for vaginal examination in women. Lidocaine hydrochloride gel paste is a surface anesthetic drug, the use of different parts of the drug, there may be different methods of use, for example, women in the vaginal examination, can be directly with a cotton dipped in 5-7 ml of this drug applied to the local. If upper gastrointestinal tractoscopy of the esophagus, pharynx, or trachea is required, the drug may be applied to the outer wall of the catheter for use. Too large a dose of Lidocaine Hydrochloride Collodion or too rapid absorption tends to cause tinnitus, agitation, irritability and other symptoms of central nervous system excitation, and may rapidly develop convulsions, coma, drop in blood pressure and other serious toxic reactions. Respiratory hypersensitivity, the use of the drug may cause bronchospasm, the drug may also trigger allergic or hypersensitivity reactions. Lidocaine Hydrochloride Paste is not allowed to be used in people who are allergic to this drug, people with severe heart block such as atrioventricular block of the second or third degree, bifascicular block, people with pre-existing intraventricular block and severe sinus node dysfunction. High blood levels may cause atrioventricular block, ventricular fibrillation, and cardiac arrest. As a prescription drug, it must be used in strict accordance with medical advice.