Drug interactions
Hydrochlorothiazide-valsartan + Nirmatrelvir / ritonavir
Severity: Minor
Hydrochlorothiazide-valsartan and Nirmatrelvir / ritonavir: 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
Valsartan is a substrate of hepatic uptake and efflux transporters that ritonavir can inhibit, so valsartan exposure may rise somewhat. Because the nirmatrelvir/ritonavir course is short, a clinically important effect is unlikely.
What this interaction means in plain words
Hydrochlorothiazide-valsartan and Nirmatrelvir / ritonavir 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
Ritonavir inhibition of hepatic transporters (OATP1B1, MRP2) involved in valsartan disposition.
What to do
No dose change is required; monitor for hypotension during the five-day course.
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?
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Other interactions of Hydrochlorothiazide-valsartan
- Aliskiren + Hydrochlorothiazide-valsartan Contraindicated
- Dofetilide + Hydrochlorothiazide-valsartan Contraindicated
- Hydrochlorothiazide-valsartan + Sparsentan Contraindicated
- Aldesleukin + Hydrochlorothiazide-valsartan Major
- Amifostine + Hydrochlorothiazide-valsartan Major
- Amiloride + Hydrochlorothiazide-valsartan Major
Frequently asked questions
Can I take Hydrochlorothiazide-valsartan with Nirmatrelvir / ritonavir?
MediHelp rates the interaction as minor. Hydrochlorothiazide-valsartan and Nirmatrelvir / ritonavir have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Valsartan is a substrate of hepatic uptake and efflux transporters that ritonavir can inhibit, so valsartan exposure may rise somewhat. Because the nirmatrelvir/ritonavir course is short, a clinically important effect is unlikely.
How serious is the interaction between Hydrochlorothiazide-valsartan and Nirmatrelvir / ritonavir?
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 dose change is required; monitor for hypotension during the five-day course.
What other medicines interact with Hydrochlorothiazide-valsartan?
MediHelp also lists interactions of Hydrochlorothiazide-valsartan with, for example, Aliskiren, Dofetilide, Sparsentan. The full list is on the Hydrochlorothiazide-valsartan page.
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