Mercaptopurine is an antimetabolite medication that is mostly used to treat acute myeloid leukemia (AML) and acute lymphoblastic leukemia (ALL). It is also occasionally used to treat autoimmune conditions such as ulcerative colitis and Crohn's disease. It works as an analog of purine, interfering with the synthesis of nucleic acids and hence preventing the growth of new cells. When taken orally as a pill or solution, it may have adverse effects such nausea, hepatic toxicity, and an elevated risk of infection. Liver function and blood count must be regularly monitored. The incidence of the condition, advancements in treatment, and the accessibility of generics all influence its market dynamics.