Mercaptopurine: Brands, Price & Uses in Bangladesh

Mercaptopurine is a purine analog antimetabolite (thiopurine) chemotherapy agent used mainly in the treatment of blood cancers, always under specialist (oncology/hematology) supervision.

Established / FDA-approved use

• Acute lymphoblastic leukemia (ALL): Mercaptopurine is indicated as part of combination chemotherapy for the maintenance phase of treatment of ALL in adults and children. It is not effective as a single agent for remission induction and is not indicated for acute myeloid leukemia, CNS leukemia, or solid tumors.

Guideline-supported / commonly used off-label

• Inflammatory bowel disease (Crohn's disease, ulcerative colitis): Mercaptopurine is used off-label (though supported by clinical practice and some guidelines) as a steroid-sparing immunosuppressant/maintenance agent when other thiopurines (e.g., azathioprine) are not tolerated, and in select autoimmune conditions, always under specialist supervision.

Mercaptopurine is always used as part of a combination regimen decided by a specialist; it should never be started, changed, or stopped without direct medical supervision.

Important

Mercaptopurine dosing must be individualized and supervised by a physician experienced in cancer chemotherapy or immunosuppressive therapy, with regular blood count and liver function monitoring. Doses below are general reference ranges only.

TPMT/NUDT15-based dose adjustment

• Patients with homozygous TPMT or NUDT15 deficiency: substantially reduced starting dose (as low as 10% or less of the usual dose) is typically required.
• Patients with heterozygous deficiency: may tolerate standard doses but often need reduction based on monitoring.

Dose adjustment with allopurinol

Concomitant allopurinol requires reducing the Mercaptopurine dose to about one-quarter to one-third of the usual dose — see Interactions.

Renal/hepatic impairment

Use the lowest recommended starting dose in patients with renal or hepatic impairment, with close monitoring of blood counts and liver enzymes.

Missed dose

Do not double the dose to make up for a missed one; contact the treating physician for instructions specific to the chemotherapy schedule.

Side effects of Mercaptopurine are frequent and dose-related; regular monitoring by the treating physician is essential.

Very common

• Myelosuppression — anemia, leukopenia, and thrombocytopenia (low red cells, white cells, and platelets)

Common

• Loss of appetite, nausea, vomiting, diarrhea
• Mouth sores (stomatitis)
• General weakness/malaise, skin rash
• Elevated liver enzymes

Less common but serious

• Hepatotoxicity, including liver fibrosis or, rarely, liver failure
• Pancreatitis
• Increased susceptibility to infections due to immunosuppression
• Secondary cancers (e.g., lymphoma, skin cancers) with long-term use
• Hair thinning (alopecia), pulmonary fibrosis (rare)

Patients should seek prompt medical attention for fever, unusual bleeding/bruising, signs of infection, yellowing of the skin/eyes, or severe abdominal pain while taking Mercaptopurine.