(Other name for: mercaptopurine) or (Other name for: mercaptopurine oral suspension) or A drug used to treat acute lymphoblastic leukemia. It may also be used to treat certain other conditions, such as Crohn disease and ulcerative colitis. Purixan stops cells from dividing and may kill cancer cells. It is a type of antimetabolite. Also called mercaptopurine and Purinethol.