Tacrolimus is an immunosuppressant drug, not an antibiotic drug. 1. The essence of tacrolimus ointment is a new type of immunosuppressant, its main pharmacological effect is to inhibit the release of interleukin, the overall inhibition of T-lymphocyte activity, so as to have the role of immunomodulation, suitable for the treatment of patients with moderate to severe atopic dermatitis who have not responded favorably to or are unable to tolerate traditional therapies. Therefore, it does not belong to the category of antibiotics. 2. Tacrolimus Ointment is a prescription drug and must be evaluated by a physician before use. It is contraindicated for those who have had an allergic reaction to tacrolimus or the ingredients in the preparation, pregnant women, and should be used with caution by breastfeeding women. Some patients may experience adverse reactions such as abnormal vision, abscesses, allergic-like reactions, anemia, anorexia, arthropathy, dyspnea, and ear discomfort. Note that this drug should not be used continuously for long periods of time. Before using Tacrolimus Ointment, be sure to read the instruction manual carefully and use it under the guidance of a doctor.