Artemether and Simvastatin: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 4, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Artemether
No brand names on recordSimvastatin
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.
Here's what's going on. Artemether is a medicine used to treat malaria, and simvastatin (Zocor) is a cholesterol-lowering statin. In theory, artemether may speed up how your body breaks down simvastatin. That could mean less simvastatin is around to do its job, so it might not lower your cholesterol as well while you're taking both.
The good news is that this is based on theory, not strong real-world reports, and malaria treatment courses are usually short. Please don't change anything on your own. Your pharmacist or doctor can keep an eye on things and adjust your plan if needed. Just let them know you're taking both.
Effect: Artemether may induce CYP3A4, potentially reducing exposure (AUC/Cmax) of simvastatin, a CYP3A4 substrate, and lowering its lipid-lowering efficacy.
- Direction: Enzyme induction leads to reduced simvastatin exposure and effect (neither drug is prodrug-dependent for this pathway).
- Magnitude: Not quantified.
- Onset: Unspecified; induction typically develops over days.
- Evidence: Theoretical.
- Management: Given the usually short artemether course, clinically significant loss of statin efficacy is unlikely. Exercise caution; monitor lipid response if concurrent use is prolonged. Dosing may be individualized by the care team.
What happens
Reduced CYP3A4 substrate exposure and reduced efficacy of CYP3A4 substrate
Interaction Deep Dive
Use care when combining artemether/lumefantrine with substrates of CYP3A4, since this pairing can lower the exposure of those CYP3A4 substrates, potentially diminishing their effectiveness1.
Why it happens (mechanism)
Induction of CYP3A4-substrate metabolism by artemether/lumefantrine
How to manage this interaction
What your care team may do:
- Keep taking both medicines as prescribed unless told otherwise.
- Recognize that artemether for malaria is usually a short course, so any drop in statin effect is likely brief.
- Your team may monitor your cholesterol response more closely if you use these together for longer, and your statin dose can be adjusted and individualized if needed.
What to do: Tell your pharmacist or prescriber you take both, and ask before starting or stopping anything. Raise any concerns about your cholesterol control at your next visit.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Artemether and Simvastatin together?
Artemether may lower simvastatin levels and make it less effective at controlling cholesterol, but this is theoretical and the malaria course is short. Keep taking both as prescribed and let your pharmacist or doctor know you use them together. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Artemether and Simvastatin 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 Artemether and Simvastatin interaction managed?
What your care team may do: Keep taking both medicines as prescribed unless told otherwise. Recognize that artemether for malaria is usually a short course, so any drop in statin effect is likely brief. Your team may monitor your cholesterol response more closely if you use these together for longer, and your statin dose can be adjusted and individualized if needed. What to do: Tell your pharmacis… 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.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Artemether or Simvastatin 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 Simvastatin
These medications also interact with supplements
Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
Check another combination
Our instant two-drug interaction checker is almost here.
Still have questions about this combination?
Every question gets a real answer from a licensed pharmacist — free, and usually within a day.
Ask the pharmacist