Drug interactions
Dapsone + Fosamprenavir
Severity: Minor
Dapsone and Fosamprenavir: minor 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
Fosamprenavir, as amprenavir, inhibits CYP3A4 and may increase dapsone concentrations. This could modestly raise the risk of hematologic adverse effects.
What this interaction means in plain words
Dapsone and Fosamprenavir have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Amprenavir inhibits CYP3A4, reducing dapsone metabolism.
What to do
Monitor hemoglobin and signs of methemoglobinemia. Reduce the dapsone dose if toxicity occurs.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Dapsone and Fosamprenavir, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 7 days on the web. No card needed.
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
Frequently asked questions
Can I take Dapsone with Fosamprenavir?
MediHelp rates the interaction as minor. Dapsone and Fosamprenavir have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Fosamprenavir, as amprenavir, inhibits CYP3A4 and may increase dapsone concentrations. This could modestly raise the risk of hematologic adverse effects.
How serious is the interaction between Dapsone and Fosamprenavir?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor hemoglobin and signs of methemoglobinemia. 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
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
