The supplied 1 mg Tacrolimus Capsules are White, Capsule-shape and has been identified as Tacrolimus 1 mg. TACROLIMUS (ta KROE li mus) is used to decrease the immune system's response to a transplanted organ. Tacrolimus is used with other medications to prevent rejection of a kidney, heart, or liver transplant. This medication belongs to a class of drugs known as immunosuppressant. Taking tacrolimus with food can reduce some of the abdominal pain that can occur with this medicine. It is used to keep the body from harming the organ after an organ transplant. The offered 1 mg Tacrolimus Capsules are very effective and useful.