Drug interactions
Carbamazepine + Nirmatrelvir
Severity: Contraindicated
Carbamazepine and Nirmatrelvir: contraindicated 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
Carbamazepine markedly lowers nirmatrelvir concentrations, risking loss of antiviral efficacy against SARS-CoV-2 and possible resistance. The inducing effect persists after carbamazepine is stopped.
What this interaction means in plain words
Carbamazepine and Nirmatrelvir are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two.
Carbamazepine belongs to Central Nervous System; Nirmatrelvir belongs to Anti Virals.
Why it happens
Carbamazepine induces CYP3A4, accelerating nirmatrelvir metabolism.
What to do
Do not use together; consider another COVID-19 antiviral not affected by inducers. Allow a washout of the inducer before starting nirmatrelvir.
What to ask your pharmacist
- Is there an alternative to one of these two medicines for me?
- If both are essential, who is monitoring me and how often?
- Which symptoms mean I should stop and seek help straight away?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Carbamazepine and Nirmatrelvir, 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 14 days on the web. No card needed.
Other interactions of Carbamazepine
- Artemether / lumefantrine + Carbamazepine Contraindicated
- Cabotegravir + Carbamazepine Contraindicated
- Carbamazepine + Delamanid Contraindicated
- Carbamazepine + Dienogest / estradiol valerate Contraindicated
- Carbamazepine + Doravirine Contraindicated
- Carbamazepine + Elbasvir / grazoprevir Contraindicated
Other interactions of Nirmatrelvir
- Alfuzosin + Nirmatrelvir Contraindicated
- Amiodarone + Nirmatrelvir Contraindicated
- Apalutamide + Nirmatrelvir Contraindicated
- Colchicine + Nirmatrelvir Contraindicated
- Dronedarone + Nirmatrelvir Contraindicated
- Enzalutamide + Nirmatrelvir Contraindicated
Frequently asked questions
Can I take Carbamazepine with Nirmatrelvir?
MediHelp rates the interaction as contraindicated. Carbamazepine and Nirmatrelvir are not normally used together. Taking them at the same time is expected to cause harm or make one of them unsafe, so a different medicine is usually chosen for one of the two. Carbamazepine markedly lowers nirmatrelvir concentrations, risking loss of antiviral efficacy against SARS-CoV-2 and possible resistance. The inducing effect persists after carbamazepine is stopped.
How serious is the interaction between Carbamazepine and Nirmatrelvir?
MediHelp rates it contraindicated, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Do not use together; consider another COVID-19 antiviral not affected by inducers. Allow a washout of the inducer before starting nirmatrelvir.
What other medicines interact with Carbamazepine?
MediHelp also lists interactions of Carbamazepine with, for example, Artemether / lumefantrine, Cabotegravir, Delamanid. The full list is on the Carbamazepine 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.
