The Tacrolimus Ointment works by stopping the immune system from producing substances that may cause eczema. It is a prescription medicine used on the skin (topical) to treat eczema (atopic dermatitis). Tacrolimus ointment is in a class of medicines called topical calcineurin inhibitors. It contains tacrolimus USP, a macrolide immunosuppressant produced by Streptomyces tsukubaensis. It is for topical dermatologic use only. It is used to treat the symptoms of eczema. The offered Tacrolimus Ointment is very effective and made for medical uses.