Vitilimus 0.03% is a topical immunosuppressant ointment containing Tacrolimus, a calcineurin inhibitor. It is primarily used to treat moderate to severe atopic dermatitis (eczema), especially in patients who are unresponsive to or intolerant of conventional therapies like corticosteroids. Tacrolimus works by suppressing the immune response that leads to skin inflammation, thereby reducing redness, itching, and swelling.