Tretinoin Neomycin Patch usually takes effect in about 2 weeks, but due to individual differences, the time to effect cannot be generalized. If the patient’s condition is serious, it will delay the onset of action, and may take effect in about 4 weeks. Tretinoin Neomycin Patch is indicated for chronic eczema, limited neurodermatitis, and small areas of psoriasis. Usually, the patch will work in about 2 weeks, but if the patient has deep wounds and severe disease, it will delay the onset of action and may work in about 4 weeks. Patients may experience adverse reactions such as hirsutism, depression, osteoporosis, etc. If you suffer from hypertension, osteoporosis, heart disease, etc., you should use this product with caution. It is prohibited for those who are allergic to the product, those with broken skin, and those with inflammatory oozing vesiculobullous dermatosis, in addition, it is not suitable for those who are hairy or allergic to rubber to apply it. If you want to know the specific starting time of tretinoin neomycin cream, it is recommended to go to the regular hospital to consult the doctor and use the medicine under the doctor’s guidance, avoiding unauthorized use of drugs.