Leukemias, lymphomas, and other hematologic cancers:
Indications for Thioguanine:
Remission induction and remission consolidation treatment of acute nonlymphocytic leukemias. Treatment of the chronic phase of chronic myelogenous leukemia (see full labeling).
Adults and Children:
See full labeling. Initially, 2mg/kg per day. If, after 4 weeks, with no improvement, no leukocyte or platelet depression, may increase to 3mg/kg per day. Total daily dose may be given at one time.
Allergy to mercaptopurine.
Not recommended for maintenance therapy or long-term continuous treatments; increased risk of liver toxicity (discontinue if occurs). Pre-existing liver disease. Monitor liver function tests weekly at start of therapy, then monthly thereafter. Thiopurine S-methyltransferase (TPMT) or nucleotide diphosphatase (NUDT15) deficiency (may need to reduce dose to avoid severe bone marrow suppression); consider testing for TPMT and NUDT15 deficiency. Obtain hemoglobin, hematocrit, WBCs with differential, platelets frequently during therapy. Pregnancy (Cat.D); avoid use. Nursing mothers: not recommended.
Avoid live vaccines (if immunocompromised). Caution with drugs that inhibit TPMT (eg, olsalazine, mesalazine, or sulphasalazine).
Myelosuppression, hyperuricemia, GI upset, anorexia, stomatitis, hepatotoxicity, elevated liver enzymes, jaundice (discontinue if occurs).
Formerly known under the brand name Tabloid.