Drug interactions
Mercaptopurine + Mycophenolate
Severity: Major
Mercaptopurine and Mycophenolate: major interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Both drugs suppress lymphocyte proliferation by interfering with purine metabolism, so together they increase the risk of infection, myelosuppression and malignancy. Combination is generally unnecessary and not recommended.
What this interaction means in plain words
Mercaptopurine and Mycophenolate can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Additive antiproliferative and myelosuppressive effects through overlapping effects on purine synthesis pathways.
What to do
Avoid using a thiopurine with mycophenolate unless a specialist has chosen it deliberately. If combined, monitor full blood count frequently and watch for infection.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Mercaptopurine
- Adenovirus types 4 and 7 live + Mercaptopurine Contraindicated
- Azathioprine + Mercaptopurine Contraindicated
- Bcg vaccine live + Mercaptopurine Contraindicated
- Febuxostat + Mercaptopurine Contraindicated
- Influenza virus vaccine quadrivalent intranasal + Mercaptopurine Contraindicated
- Mercaptopurine + Smallpox vaccine live Contraindicated
Frequently asked questions
Can I take Mercaptopurine with Mycophenolate?
MediHelp rates the interaction as major. Mercaptopurine and Mycophenolate can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Both drugs suppress lymphocyte proliferation by interfering with purine metabolism, so together they increase the risk of infection, myelosuppression and malignancy. Combination is generally unnecessary and not recommended.
How serious is the interaction between Mercaptopurine and Mycophenolate?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid using a thiopurine with mycophenolate unless a specialist has chosen it deliberately. If combined, monitor full blood count frequently and watch for infection.
What other medicines interact with Mercaptopurine?
MediHelp also lists interactions of Mercaptopurine with, for example, Adenovirus types 4 and 7 live, Azathioprine, Bcg vaccine live. The full list is on the Mercaptopurine page.
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