any of several drugs that control or kill neoplastic cells; used in chemotherapy to kill cancer cells; all have unpleasant side effects that may include nausea and vomiting and hair loss and suppression of bone marrow function

an antimetabolite used to treat certain cancers

a drug (trade name Purinethol) that interferes with the metabolism of purine and is used to treat acute lymphocytic leukemia

toxic antimetabolite that limits cellular reproduction by acting as an antagonist to folic acid; used to treat certain cancers and psoriasis and rheumatoid arthritis