Drug interactions
Fexofenadine + Fostemsavir
Severity: Minor
Fexofenadine and Fostemsavir: 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
Fostemsavir's active metabolite temsavir inhibits OATP1B1/1B3, which contribute to fexofenadine uptake and clearance. Fexofenadine exposure may rise modestly, which is rarely harmful.
What this interaction means in plain words
Fexofenadine and Fostemsavir have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Fexofenadine belongs to Respiratory; Fostemsavir belongs to Anti Virals.
Why it happens
Temsavir inhibits OATP1B1/1B3 transporters, reducing hepatic uptake of fexofenadine.
What to do
No routine adjustment is needed; monitor for increased antihistamine effects and reduce the fexofenadine dose if necessary.
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 Fexofenadine and Fostemsavir, 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 Fexofenadine
- Danicopan + Fexofenadine Moderate
- Erdafitinib + Fexofenadine Moderate
- Fexofenadine + Glecaprevir / pibrentasvir Moderate
- Fexofenadine + Grapefruit Moderate
- Fexofenadine + Juice Moderate
- Acrivastine + Fexofenadine Minor
Other interactions of Fostemsavir
- Apalutamide + Fostemsavir Contraindicated
- Carbamazepine + Fostemsavir Contraindicated
- Enzalutamide + Fostemsavir Contraindicated
- Fostemsavir + Mitotane Contraindicated
- Fostemsavir + Phenytoin Contraindicated
- Fostemsavir + Rifampicin Contraindicated
Frequently asked questions
Can I take Fexofenadine with Fostemsavir?
MediHelp rates the interaction as minor. Fexofenadine and Fostemsavir have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Fostemsavir's active metabolite temsavir inhibits OATP1B1/1B3, which contribute to fexofenadine uptake and clearance. Fexofenadine exposure may rise modestly, which is rarely harmful.
How serious is the interaction between Fexofenadine and Fostemsavir?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No routine adjustment is needed; monitor for increased antihistamine effects and reduce the fexofenadine dose if necessary.
What other medicines interact with Fexofenadine?
MediHelp also lists interactions of Fexofenadine with, for example, Danicopan, Erdafitinib, Glecaprevir / pibrentasvir. The full list is on the Fexofenadine 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.
