Drug interactions
Carbamazepine + Fosaprepitant
Severity: Moderate
Carbamazepine and Fosaprepitant: 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
Carbamazepine may lower aprepitant exposure from fosaprepitant and reduce protection against chemotherapy-induced vomiting.
What this interaction means in plain words
Carbamazepine and Fosaprepitant 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.
Carbamazepine belongs to Central Nervous System; Fosaprepitant belongs to Gastrointestinal Tract.
Why it happens
Carbamazepine induces CYP3A4, increasing aprepitant metabolism.
What to do
Monitor antiemetic control and add other antiemetics as needed. Single-dose fosaprepitant effect is usually limited.
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?
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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 Fosaprepitant
- Flibanserin + Fosaprepitant Contraindicated
- Fosaprepitant + Pimozide Contraindicated
- Alprazolam + Fosaprepitant Moderate
- Amiodarone + Fosaprepitant Moderate
- Amobarbital + Fosaprepitant Moderate
- Apalutamide + Fosaprepitant Moderate
Frequently asked questions
Can I take Carbamazepine with Fosaprepitant?
MediHelp rates the interaction as moderate. Carbamazepine and Fosaprepitant 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. Carbamazepine may lower aprepitant exposure from fosaprepitant and reduce protection against chemotherapy-induced vomiting.
How serious is the interaction between Carbamazepine and Fosaprepitant?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor antiemetic control and add other antiemetics as needed. Single-dose fosaprepitant effect is usually limited.
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.
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