Answer
Mercaptopurine can suppress bone marrow and injure the liver. Blood tests help detect low blood-cell counts, liver abnormalities and renal changes before complications become severe.
Sources for this answer
- NHS Specialist Pharmacy ServiceNHS Specialist Pharmacy Service · NHS medicine guidance
- Mercaptopurine 50 mg tablets — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.