Tacrolimus has the effect of inhibiting the activity of calmodulin phosphatase, and side effects such as decreased urine output, increased urea nitrogen, headache, insomnia, convulsions, high blood pressure, dehydration, changes in appetite, and colitis may occur during the administration of the drug. Tacrolimus is indicated in cases of rejection after kidney or liver transplantation that cannot be controlled by other immunologic agents. Regular checks of vision, electrocardiogram, blood pressure, blood glucose concentration, and liver function are required during the medication period in order to adjust the dosage in a timely manner. This product should not be combined with cyclosporine drugs. It is contraindicated in women during pregnancy, those who are allergic to this product and other macrolides. If you need to use tacrolimus, it is recommended to go to a regular hospital to consult a doctor and use the drug under the doctor’s guidance, and not unauthorized use of drugs.