Abemaciclib and Artemether: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 10, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Artemether
No brand names on recordAbemaciclib
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
You've been prescribed abemaciclib (Verzenio), a cancer medicine, along with artemether, which is used to treat malaria. Here's the concern: artemether may speed up the way your body breaks down abemaciclib. If that happens, there could be less of your cancer medicine in your system than intended, which could make it work less well.
I want to be clear that this is a theoretical concern, meaning it's based on how these drugs are handled by the body rather than lots of real-world reports. Please don't change anything on your own. Your care team can manage this by tailoring your treatment and watching you more closely, so bring it up with your oncologist or pharmacist.
Effect: Artemether (a component of artemether/lumefantrine) may induce CYP3A4, potentially increasing clearance of abemaciclib, a CYP3A4 substrate, and lowering its exposure (AUC/Cmax) with possible reduced antineoplastic efficacy.
- Direction: Enzyme induction, reduced substrate exposure (not a prodrug situation, so effect is diminished).
- Evidence: Theoretical; magnitude not quantified.
- Onset: Unspecified.
- Management: Exert caution with coadministration. Abemaciclib dosing may need individualization; monitor clinical/oncologic response. Artemether/lumefantrine courses are typically short, limiting duration of exposure.
What happens
Reduced CYP3A4 substrate exposure and reduced efficacy of CYP3A4 substrate
Interaction Deep Dive
Use care if artemether/lumefantrine is given together with CYP3A4 substrates, since the combination can lower the exposure of those substrates and, as a result, may diminish their efficacy1.
Why it happens (mechanism)
Induction of CYP3A4-substrate metabolism by artemether/lumefantrine
How to manage this interaction
Keep taking both medicines exactly as prescribed unless your care team tells you otherwise. Because artemether may lower the amount of abemaciclib in your body, here's what typically helps:
- Tell your oncologist and pharmacist that you've been prescribed both, especially since abemaciclib is a cancer medicine where dose matters.
- Your team may monitor your response more closely, and your abemaciclib dose may need to be adjusted and individualized.
- Note that malaria treatment courses of artemether are usually short, which limits how long the overlap lasts.
Reach out promptly if you have any concerns, but do not stop or change either drug on your own.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Abemaciclib and Artemether together?
Artemether may speed up how your body clears abemaciclib, possibly lowering its levels and effectiveness; this is a theoretical concern, so keep taking both as prescribed and let your oncologist and pharmacist know so they can monitor and adjust as needed. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Abemaciclib and Artemether interaction?
It is rated moderate. Can be significant — usually manageable with monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Abemaciclib and Artemether interaction managed?
Keep taking both medicines exactly as prescribed unless your care team tells you otherwise. Because artemether may lower the amount of abemaciclib in your body, here's what typically helps: Tell your oncologist and pharmacist that you've been prescribed both, especially since abemaciclib is a cancer medicine where dose matters. Your team may monitor your response more closely, and your abemaciclib… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
Questions for your pharmacist
- Does my dose of Abemaciclib or Artemether need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there anything you'd monitor while I'm on both?
References (1)
- Product Information: COARTEM® oral tablets, artemether lumefantrine oral tablets. Novartis Pharmaceuticals Corporation (per DailyMed), East Hanover, NJ, 2025. DailyMed
Keep reading about Artemether
Keep reading about Abemaciclib
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