An antimetabolite's a chemical that inhibits the use of a metabolite, which's another chemical that's part of normal metabolism. Such substances are often similar in structure to the metabolite that they interfere with, such as the antifolates that interfere with the use of folic acid. The presence of antimetabolites can have toxic effects on cells, such as halting cell growth and cell division, so these compounds are used as chemotherapy for cancer. Function Cancer treatment Antimetabolites can… (More on Antimetabolite)