What type of drug is 5-FU?

5-FU, or 5-fluorouracil, is classified as a chemotherapy drug. It is a fluorinated pyrimidine analog used primarily in the treatment of various cancers, including colorectal, breast, stomach, and pancreatic cancers. The mechanism of action involves inhibiting DNA synthesis, which is critical for the replication of cancer cells. By interfering with the synthesis of nucleic acids, it prevents the growth and division of rapidly dividing cancerous cells, thus serving its purpose as a chemotherapeutic agent.

In the context of cancer treatment, the use of 5-FU is significant due to its ability to target and disrupt the proliferation of malignant cells while often being part of a combination regimen that can enhance its efficacy. This distinguishes it from analgesics, antibiotics, or anesthetics, which serve entirely different therapeutic purposes in medical practice.