Dacronin has no effect after a period of time, usually due to the patient’s frequent use, resulting in the development of drug resistance of the body related. If you need to use the drug, you need to use it under the guidance of a doctor. Dacronin is a local anesthetic used to relieve pain and has a surface anesthetic effect on mucous membranes. It can be used for headaches caused by colds and flu, as well as arthralgia, toothache, etc., or pain caused by sports trauma, chronic soft tissue strain, bone and joint diseases. If patients use Dacronin frequently, it is possible to make the organism develop drug resistance, so there will be a situation in which there is no effect after a period of time. When using this drug, patients need to use it according to the doctor’s instructions, and should not adjust the number of times of use and dosage without authorization. If drug resistance occurs, you can change the use of other pain medication under the guidance of the doctor. However, it is not recommended that patients use painkillers frequently.