Ancotil, also known by its generic name flucytosine, is an antifungal medication primarily used in the treatment of serious fungal infections. It works by inhibiting the synthesis of fungal DNA and RNA, effectively stopping the growth and proliferation of fungal cells. Ancotil is often used in combination with other antifungal agents to enhance its efficacy, especially in treating systemic infections such as cryptococcal meningitis, a life-threatening condition commonly associated with HIV/AIDS. Due to its potential side effects, including bone marrow suppression and liver toxicity, the use of Ancotil requires careful monitoring by healthcare professionals. It is typically administered orally or intravenously, depending on the severity of the infection and the patient's overall health condition.