Drug interactions
Amlodipine + Nirmatrelvir / ritonavir
Severity: Moderate
Amlodipine and Nirmatrelvir / ritonavir: 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
Ritonavir is a strong CYP3A4 inhibitor and raises amlodipine concentrations considerably. This can cause hypotension, dizziness and peripheral edema during and shortly after the antiviral course.
What this interaction means in plain words
Amlodipine and Nirmatrelvir / ritonavir 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.
Why it happens
Ritonavir inhibits CYP3A4 and reduces amlodipine metabolism.
What to do
Consider reducing the amlodipine dose by about half during treatment and for a few days after, with blood pressure and edema monitoring. Return to the usual dose once ritonavir effect has worn off.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Amlodipine and Nirmatrelvir / ritonavir, 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 Amlodipine
- Amifostine + Amlodipine Major
- Amlodipine + Ombitasvir / paritaprevir / ritonavir and dasabuvir Major
- Activated Charcoal + Amlodipine Moderate
- Aldesleukin + Amlodipine Moderate
- Alfuzosin + Amlodipine Moderate
- Amlodipine + Apalutamide Moderate
Frequently asked questions
Can I take Amlodipine with Nirmatrelvir / ritonavir?
MediHelp rates the interaction as moderate. Amlodipine and Nirmatrelvir / ritonavir 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. Ritonavir is a strong CYP3A4 inhibitor and raises amlodipine concentrations considerably. This can cause hypotension, dizziness and peripheral edema during and shortly after the antiviral course.
How serious is the interaction between Amlodipine and Nirmatrelvir / ritonavir?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Consider reducing the amlodipine dose by about half during treatment and for a few days after, with blood pressure and edema monitoring. Return to the usual dose once ritonavir effect has worn off.
What other medicines interact with Amlodipine?
MediHelp also lists interactions of Amlodipine with, for example, Amifostine, Ombitasvir / paritaprevir / ritonavir and dasabuvir, Activated Charcoal. The full list is on the Amlodipine 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.
