Drug interactions
Carbamazepine + Nifedipine
Severity: Major
Carbamazepine and Nifedipine: major 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 is a strong CYP3A4 inducer and can markedly lower nifedipine levels, causing loss of blood pressure or angina control. Calcium channel blockers may also raise carbamazepine levels, with risk of neurotoxicity.
What this interaction means in plain words
Carbamazepine and Nifedipine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Carbamazepine belongs to Central Nervous System; Nifedipine belongs to Cardiovascular.
Why it happens
Carbamazepine induces CYP3A4 metabolism of nifedipine, while nifedipine may inhibit carbamazepine clearance.
What to do
Monitor blood pressure and consider a higher nifedipine dose or an alternative antihypertensive. Check carbamazepine levels and watch for dizziness, ataxia or diplopia.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Nifedipine
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
Frequently asked questions
Can I take Carbamazepine with Nifedipine?
MediHelp rates the interaction as major. Carbamazepine and Nifedipine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Carbamazepine is a strong CYP3A4 inducer and can markedly lower nifedipine levels, causing loss of blood pressure or angina control. Calcium channel blockers may also raise carbamazepine levels, with risk of neurotoxicity.
How serious is the interaction between Carbamazepine and Nifedipine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood pressure and consider a higher nifedipine dose or an alternative antihypertensive. Check carbamazepine levels and watch for dizziness, ataxia or diplopia.
What other medicines interact with Nifedipine?
MediHelp also lists interactions of Nifedipine with, for example, Amifostine, Amlodipine-benazepril, Apalutamide. The full list is on the Nifedipine page.
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