Trospium / Xanomeline and Lovastatin: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 2, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Lovastatin
Trospium / Xanomeline
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: One ingredient in Cobenfy, called xanomeline, can briefly slow down an enzyme in your gut (CYP3A4) that helps break down lovastatin. When lovastatin isn't broken down as quickly, more of it can get into your body than usual.
With more lovastatin around, you might be a little more likely to notice statin side effects, like muscle aches or soreness. This is based on how the drugs work in theory, not on strong real-world reports, so there's no need to panic. Please don't stop or change either medicine on your own. Just let your pharmacist or doctor know you take both, and tell them right away if you get unexplained muscle pain or weakness.
Mechanism: Xanomeline (in Cobenfy) transiently inhibits intestinal CYP3A4 without meaningful systemic inhibition. Lovastatin is a sensitive oral CYP3A4 substrate, so first-pass metabolism may decrease, raising lovastatin AUC/Cmax.
- Direction: Increased lovastatin exposure (not a prodrug issue; lovastatin's active moiety rises with reduced metabolism).
- Clinical effect: Higher risk/severity of statin adverse effects (myalgia, transaminase elevation, rare rhabdomyolysis).
- Evidence: Theoretical. Onset: unspecified. Severity: moderate.
Management: Continue both if prescribed; monitor for myopathy symptoms and consider CK/LFTs if warranted. Dose may be individualized by the care team.
What happens
Increased oral sensitive CYP3A4 substrate exposure and an increased risk on severity and frequency of sensitive CYP3A4 substrate-related adverse reactions
Interaction Deep Dive
Within the gut, xanomeline produces a temporary, local inhibition of CYP3A4, though this effect does not extend systemically. When xanomeline is taken alongside oral medications that act as sensitive CYP3A4 substrates, the exposure to those oral substrates may rise. As a result, adverse reactions attributable to these substrates could occur more often and/or become more severe. In cases of combined use, patients should be watched for any increase in the frequency and/or severity of adverse reactions tied to oral drugs that are sensitive CYP3A4 substrates1.
Why it happens (mechanism)
Inhibition of CYP3A4-substrate metabolism by xanomeline
How to manage this interaction
Keep taking both medicines as prescribed unless your prescriber tells you otherwise. Because this interaction can raise lovastatin levels, your care team's main tool here is closer monitoring.
- Your team may watch you more closely for statin side effects, especially muscle pain, tenderness, or weakness.
- Your lovastatin dose may be adjusted and individualized by your care team if needed.
- Tell your pharmacist or doctor right away if you notice unexplained muscle aches, dark urine, or unusual tiredness.
- Make sure both medicines are on your current medication list so everyone caring for you knows.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Trospium / Xanomeline and Lovastatin together?
Cobenfy (xanomeline) can briefly slow how your gut breaks down lovastatin, which may raise lovastatin levels and the chance of statin side effects like muscle pain. Keep taking both as prescribed, watch for muscle symptoms, and report them to your pharmacist or doctor. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Trospium / Xanomeline and Lovastatin 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 Trospium / Xanomeline and Lovastatin interaction managed?
Keep taking both medicines as prescribed unless your prescriber tells you otherwise. Because this interaction can raise lovastatin levels, your care team's main tool here is closer monitoring. Your team may watch you more closely for statin side effects, especially muscle pain, tenderness, or weakness. Your lovastatin dose may be adjusted and individualized by your care team if needed. Tell your p… 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 Trospium / Xanomeline or Lovastatin 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)
- Citation #1
Keep reading about Lovastatin
Keep reading about Trospium / Xanomeline
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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