what is purinethol
Uses. This medication is used with other drugs to treat a certain type of cancer (acute lymphocytic leukemia). Mercaptopurine belongs to a class of drugs known as purine antagonists.It works by slowing or stopping the growth of cancer cells.ercaptopurine is very similar to azathioprine. Do not use medications containing azathioprine while using mercaptopurine. This document does not contain all possible interactions. Therefore, before using this product, tell your doctor or pharmacist of all the products you use.