The use of Dacronin may cause burning skin irritation, as well as allergic reactions such as rash and itching, and side effects such as mild headache, anxiety, and numbness. Dacronin is a compounded preparation for topical use and is a local anesthetic with a surface anesthetic effect on the mucous membranes. The commonly used dosage forms are compound solution, patch, film, etc. Different dosage forms, their indications and adverse reactions are different. Compound Dacronin Mint Solution is mainly used for headache caused by cold and flu, as well as toothache, arthralgia, abdominal distension and pain, and can also be used for discomfort caused by mosquito bites and motion sickness. Some patients may experience skin irritation such as burning sensation when using this medicine, and some patients may also experience allergic reactions such as rash and itching. Once serious discomfort occurs, the drug should be discontinued and the topical medication should be washed off and treated accordingly by a doctor if necessary. Dacronin Hydrochloride Collodion is clinically used for laryngeal anesthesia and lubrication during upper gastrointestinal endoscopy, and in the process of medication, due to the patients’ poor tolerance of this drug, it may cause headache, anxiety, numbness, etc., and the symptoms are generally mild. Compound indomethacin dacronin cream is suitable for the relief of local soft tissue pain , but for the periocular and mucosal tissues, skin breaks and other parts of the need to prohibit the use of, and is not applicable to children under 15 years of age patients. Dacronin should be used under the guidance of a doctor, patients should not blindly self-medication, in order to avoid serious side effects.