Simvastatin and Elexacaftor: 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
Simvastatin
Elexacaftor
No brand names on record
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.
What's going on: Simvastatin (Zocor) is cleared by liver transporters that help move it into and out of the liver. Elexacaftor can slow those transporters down. In theory, that could let more simvastatin build up in your blood than usual.
Higher simvastatin levels can raise the small chance of muscle aches or, rarely, more serious muscle problems. The good news is this concern is based on how the drugs work rather than strong real-world reports, and your care team can manage it easily. If you take both, just let your pharmacist or doctor know, and mention any new muscle pain, tenderness, or weakness so they can keep an eye on things and adjust if needed.
Mechanism: Elexacaftor inhibits OATP1B1/OATP1B3-mediated hepatic uptake. Simvastatin (active acid form) is an OATP1B1/1B3 substrate, so inhibition can raise its systemic exposure (AUC/Cmax).
Direction: Increased simvastatin exposure, raising myopathy/rhabdomyolysis risk. Neither is a prodrug in a way that reverses this; the statin acid is the relevant substrate.
- Evidence: Theoretical (transporter-based prediction).
- Onset: Unspecified.
- Management: Use with caution; monitor for muscle symptoms and consider CK if symptomatic. Statin dose may be individualized by the care team; consider closer follow-up.
What happens
Increased OATP1B1/OATP1B3 substrate exposure
Interaction Deep Dive
Taking elexacaftor together with medications that act as substrates for both OATP1B1 and OATP1B3 may raise the plasma levels of those OATP1B1/OATP1B3 substrates. Exercise caution and apply suitable monitoring whenever elexacaftor is given alongside OATP1B1/OATP1B3 substrates1.
Why it happens (mechanism)
Inhibition of OATP1B1-mediated efflux transport by elexacaftor; inhibition of OATP1B3-mediated efflux transport by elexacaftor
How to manage this interaction
Keep taking both as prescribed unless your prescriber tells you otherwise. Here is how a care team typically handles this:
- Use the combination with caution and monitor more closely for muscle-related effects.
- The simvastatin dose may need to be adjusted and individualized by your care team.
- Report any new or unexplained muscle pain, tenderness, weakness, or dark urine promptly.
What to do: Tell your pharmacist and prescriber you take both so they can decide on the right dose and monitoring for you.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Simvastatin and Elexacaftor together?
Elexacaftor may raise simvastatin blood levels by slowing its liver transport, which can increase the risk of muscle side effects; keep taking both as prescribed and report any muscle pain to your care team. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Simvastatin and Elexacaftor interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Simvastatin and Elexacaftor interaction managed?
Keep taking both as prescribed unless your prescriber tells you otherwise. Here is how a care team typically handles this: Use the combination with caution and monitor more closely for muscle-related effects. The simvastatin dose may need to be adjusted and individualized by your care team. Report any new or unexplained muscle pain, tenderness, weakness, or dark urine promptly. What to do: Tell yo… 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 Simvastatin or Elexacaftor 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 a safer alternative to one of these medications for me?
References (1)
- Product Information: TRIKAFTA(R) oral tablets oral granules, elexacaftor, tezacaftor, ivacaftor oral tablets oral granules; ivacaftor oral tablets oral granules. Vertex Pharmaceuticals Incorporated (per FDA), Boston, MA, 2024. DailyMed
Keep reading about Simvastatin
Keep reading about Elexacaftor
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