Drug interactions
Dapsone + Tucatinib
Severity: Moderate
Dapsone and Tucatinib: moderate 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
Tucatinib is a strong CYP3A inhibitor and may increase dapsone exposure. This raises the risk of hemolysis and methemoglobinemia.
What this interaction means in plain words
Dapsone and Tucatinib can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Dapsone belongs to Anti Bacterial; Tucatinib belongs to Oncology.
Why it happens
Tucatinib inhibits CYP3A4, reducing dapsone metabolism.
What to do
Monitor blood counts and methemoglobin, and reduce the dapsone dose if toxicity occurs.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Dapsone
- Bcg vaccine live + Dapsone Major
- Dapsone + Primaquine Major
- Apalutamide + Dapsone Moderate
- Belzutifan + Dapsone Moderate
- Bosentan + Dapsone Moderate
- Bupivacaine implant + Dapsone Moderate
Other interactions of Tucatinib
- Cisapride + Tucatinib Contraindicated
- Eletriptan + Tucatinib Contraindicated
- Ergotamine + Tucatinib Contraindicated
- Flibanserin + Tucatinib Contraindicated
- Ranolazine + Tucatinib Contraindicated
- Amobarbital + Tucatinib Major
Frequently asked questions
Can I take Dapsone with Tucatinib?
MediHelp rates the interaction as moderate. Dapsone and Tucatinib can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Tucatinib is a strong CYP3A inhibitor and may increase dapsone exposure. This raises the risk of hemolysis and methemoglobinemia.
How serious is the interaction between Dapsone and Tucatinib?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood counts and methemoglobin, and reduce the dapsone dose if toxicity occurs.
What other medicines interact with Dapsone?
MediHelp also lists interactions of Dapsone with, for example, Bcg vaccine live, Primaquine, Apalutamide. The full list is on the Dapsone page.
Full monographs, dosing and an interaction checker in the MediHelp app
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