Efudix, also known by its generic name fluorouracil, is a topical medication primarily used in the treatment of pre-cancerous and cancerous skin growths, specifically actinic keratosis and superficial basal cell carcinomas. It belongs to a class of drugs known as antineoplastics, which work by interfering with the growth of rapidly dividing cells, such as cancer cells. When applied to the affected skin areas, Efudix destroys the abnormal cells while causing minimal damage to normal cells. Its use is recommended under the guidance of a healthcare professional, as it can cause side effects such as skin irritation, redness, and sensitivity to sunlight. Regular monitoring and follow-up with a healthcare provider are essential to assess the treatment's effectiveness and manage any adverse reactions.