Allergic dermatitis is a large group of diseases whose withdrawal time is related to the severity of the patient’s condition, drug sensitivity, etc., and usually ranges from one week to several months. Allergy-related diseases that cause itching, pimples and other symptoms are considered atopic dermatitis, including acute urticaria, eczema, atopic dermatitis, contact dermatitis and others. Allergic dermatitis medication withdrawal time is affected by the severity of the disease, drug sensitivity, personal constitution and other factors, there are individual differences, ranging from one week to several months. The drugs used to treat atopic dermatitis include antihistamines such as loratadine, immunosuppressants such as cyclosporine, and glucocorticoids such as prednisone. Different medications are used for different lengths of time. Allergic dermatitis patients need to go to the hospital in time, to clarify the cause of the disease, under the guidance of medical professionals for drug treatment.