Tipranavir 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
Tipranavir
Simvastatin
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.
These two medicines should not be taken together. Tipranavir (Aptivus), which is given with a small dose of ritonavir, is a strong blocker of a liver enzyme called CYP3A. Your body uses that same enzyme to break down simvastatin (Zocor). When the enzyme is blocked, simvastatin can build up to much higher levels than intended.
Too much simvastatin can cause serious muscle problems, including pain, weakness, and a rare but dangerous condition called rhabdomyolysis, where muscle breaks down and harms the kidneys. The good news is that this is very manageable. Please do not stop anything on your own, but talk with your pharmacist or doctor. There are other cholesterol medicines that fit safely with tipranavir.
Contraindicated combination. Tipranavir coadministered with ritonavir 200 mg is a potent CYP3A inhibitor. Simvastatin is a CYP3A substrate, so inhibited metabolism markedly increases simvastatin systemic exposure (AUC/Cmax), raising the risk of dose-dependent myopathy and rhabdomyolysis.
- Direction: increased simvastatin effect/toxicity (simvastatin is not a prodrug requiring CYP3A activation).
- Onset: delayed. Evidence: theoretical, but severity is high and well-founded pharmacologically.
- Management: avoid combination. When an HMG-CoA reductase inhibitor is needed with tipranavir/ritonavir, consider pravastatin or fluvastatin (non-CYP3A-dependent clearance). Monitor for muscle symptoms and CK if any statin exposure has occurred.
What happens
An increased risk of myopathy or rhabdomyolysis
Interaction Deep Dive
Taking simvastatin together with tipranavir (given alongside ritonavir 200 mg) is contraindicated. Because tipranavir/ritonavir strongly inhibits CYP3A, and simvastatin is metabolized by CYP3A, this combination reduces simvastatin breakdown. The resulting CYP3A inhibition from tipranavir/ritonavir can markedly raise the likelihood of myopathy and rhabdomyolysis. If an HMG-CoA reductase inhibitor must be used at the same time as tipranavir/ritonavir, pravastatin or fluvastatin can serve as alternatives to simvastatin1.
Why it happens (mechanism)
Inhibition of CYP3A-mediated simvastatin metabolism
How to manage this interaction
The main step here is choosing a different statin. Because this specific pairing is contraindicated, care teams generally do not adjust the simvastatin dose; instead they switch to a statin that does not rely on the same liver enzyme.
- Keep taking your medicines as prescribed until you speak with your care team. Do not stop or start anything on your own.
- Ask your pharmacist or prescriber about alternatives such as pravastatin or fluvastatin, which are options when cholesterol treatment is needed alongside tipranavir/ritonavir.
- Report any muscle pain, tenderness, weakness, or dark-colored urine right away.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Tipranavir and Simvastatin together?
Simvastatin and tipranavir/ritonavir should not be used together because simvastatin levels can rise dangerously and cause muscle damage; ask your care team about switching to pravastatin or fluvastatin. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Tipranavir and Simvastatin interaction?
It is rated contraindicated. These should generally not be used together.
How quickly could this interaction happen?
The documented onset is "delayed". Effects tend to build up gradually over days to weeks.
How is the Tipranavir and Simvastatin interaction managed?
The main step here is choosing a different statin. Because this specific pairing is contraindicated, care teams generally do not adjust the simvastatin dose; instead they switch to a statin that does not rely on the same liver enzyme. Keep taking your medicines as prescribed until you speak with your care team. Do not stop or start anything on your own. Ask your pharmacist or prescriber about alte… 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 Tipranavir 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 a safer alternative to one of these medications for me?
References (1)
- Product Information: APTIVUS(R) oral capsules, tipranavir oral capsules. Boehringer Ingelheim Pharmaceuticals,Inc, Ridgefield, CT, 2007. DailyMed
Keep reading about Tipranavir
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.
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