Simvastatin and Telaprevir: 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
Telaprevir
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.
Let me explain what's going on here. Telaprevir is a medicine that blocks a liver enzyme (called CYP3A) that normally breaks down simvastatin, your cholesterol medicine. When that enzyme is blocked, simvastatin can build up to much higher levels in your blood than it should.
Too much simvastatin raises the risk of serious muscle problems, including severe muscle breakdown (rhabdomyolysis) that can harm your kidneys. Because of this, these two drugs are not meant to be taken together. The good news is your care team can manage this easily, often by pausing the statin while you're on telaprevir. Please don't stop anything on your own, just talk with your pharmacist or doctor.
Effect: Increased simvastatin plasma concentrations via telaprevir inhibition of CYP3A-mediated metabolism (simvastatin is a CYP3A4 substrate). Direction: increased statin exposure and toxicity risk.
- Severity: Contraindicated.
- Evidence: Theoretical; not directly studied, but coadministration with atorvastatin (also CYP3A) produced significant Cmax/AUC increases.
- Risk: Dose-dependent myopathy, including rhabdomyolysis.
- Onset: Unspecified.
- Management: Avoid concurrent use. If coadministration is required, temporarily suspend simvastatin for the duration of telaprevir therapy. Monitor for muscle pain, weakness, and CK elevation if exposure occurs.
What happens
Increased simvastatin concentrations
Interaction Deep Dive
While there are no studies pairing telaprevir, a CYP3A isoenzyme inhibitor, with simvastatin, a CYP3A substrate, giving telaprevir alongside atorvastatin (another statin that is also a CYP2A substrate) produced marked elevations in the Cmax and AUC of atorvastatin2. As a result, using telaprevir and simvastatin together is contraindicated because simvastatin plasma levels may rise, bringing a risk of serious adverse effects like myopathy, including rhabdomyolysis21. When the combination cannot be avoided, simvastatin should be temporarily withheld for the period of telaprevir therapy1.
Why it happens (mechanism)
Inhibition of CYP3A-mediated simvastatin metabolism
How to manage this interaction
This combination is flagged as contraindicated, so your care team will usually avoid using them at the same time. What that typically looks like:
- Your prescriber may temporarily pause simvastatin while you are taking telaprevir, then resume it afterward.
- Keep taking both exactly as prescribed until you've spoken with your care team, and don't stop anything on your own.
- Watch for and promptly report muscle pain, tenderness, weakness, or dark urine, which can signal a serious muscle problem.
Ask your pharmacist or doctor how they'd like to handle your statin during telaprevir treatment.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) In drug interaction studies, giving atorvastatin together with telaprevir to healthy subjects or to patients with chronic hepatitis C produced significant increases in mean atorvastatin AUC and Cmax. Subjects received a single 20 mg dose of atorvastatin along with telaprevir 750 mg every 8 hours for 7 days. When atorvastatin plus telaprevir was compared with atorvastatin given alone, the ratio estimate for atorvastatin was 7.88 (90% confidence interval (CI), 6.84 to 9.07) for AUC and 10.6 (90% CI, 8.74 to 12.85) for Cmax. The mean changes for Cmin were not available 2.
Common questions
Can I take Simvastatin and Telaprevir together?
Telaprevir can push simvastatin levels dangerously high and raise the risk of serious muscle damage, so this pair is contraindicated. Your care team will usually pause the simvastatin during telaprevir treatment, so check with your pharmacist or doctor before taking both. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Simvastatin and Telaprevir interaction?
It is rated contraindicated. These should generally not be used together.
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 Telaprevir interaction managed?
This combination is flagged as contraindicated, so your care team will usually avoid using them at the same time. What that typically looks like: Your prescriber may temporarily pause simvastatin while you are taking telaprevir, then resume it afterward. Keep taking both exactly as prescribed until you've spoken with your care team, and don't stop anything on your own. Watch for and promptly repor… 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 Telaprevir 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 (2)
- Product Information: ZOCOR(R) oral tablets, simvastatin oral tablets. Organon & Co (per FDA), Jersey City, NJ, 2022. DailyMed
- Product Information: INCIVEK(TM) film coated oral tablets, telaprevir film coated oral tablets. Vertex Pharmaceuticals Incorporated, Cambridge, MA, 2011.
Keep reading about Telaprevir
Keep reading about Simvastatin
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Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
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