Trospium / Xanomeline and Dasatinib: 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
Dasatinib
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.
Here's what's going on. Cobenfy contains xanomeline, which can briefly slow down an enzyme in your gut called CYP3A4. Your cancer medicine dasatinib (Sprycel or Phyrago) is broken down by that same enzyme. When the enzyme is slowed, a bit more dasatinib may get into your body than usual.
In plain terms, this could mean more of dasatinib's usual side effects, like feeling tired, fluid retention, headache, or stomach upset. This is a theoretical concern, so it may never cause you a problem. The good news is your care team can watch for this and adjust things if needed. Keep taking both exactly as prescribed and let your pharmacist or doctor know how you feel.
Mechanism: Xanomeline (in Cobenfy) transiently inhibits intestinal CYP3A4 without systemic inhibition. Dasatinib is a sensitive oral CYP3A4 substrate, so its presystemic metabolism may be reduced, raising dasatinib exposure (AUC/Cmax).
Direction: Increased dasatinib exposure and potential increase in frequency/severity of dasatinib adverse effects (myelosuppression, fluid retention, QT prolongation, GI toxicity, bleeding risk). Neither drug is a prodrug here.
- Evidence: theoretical.
- Onset: unspecified.
- Magnitude: not quantified.
- Management: monitor for increased dasatinib-related toxicity; 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 together with oral medications that are sensitive substrates of CYP3A4, the exposure to those oral CYP3A4-sensitive substrates may rise. As a result, adverse reactions associated with such substrates may occur more frequently and/or become more severe. In cases of concurrent administration, monitor patients for any increase in the frequency and/or severity of adverse reactions tied to oral drugs that are sensitive substrates of CYP3A41.
Why it happens (mechanism)
Inhibition of CYP3A4-substrate metabolism by xanomeline
How to manage this interaction
This is manageable. Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise.
- Your care team may monitor you more closely for dasatinib side effects, such as unusual tiredness, swelling, bruising or bleeding, stomach upset, or a fast or irregular heartbeat.
- The dasatinib dose may need to be adjusted and individualized by your team if side effects increase.
- Report any new or worsening symptoms to your pharmacist or doctor.
Do not start, stop, or change either medicine on your own. A quick check-in with your pharmacist can confirm this combination is right for you.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Trospium / Xanomeline and Dasatinib together?
Cobenfy (xanomeline) may raise dasatinib levels by briefly slowing gut CYP3A4, which could increase dasatinib side effects. Keep taking both as prescribed and let your care team watch for and manage any increase in side effects. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Trospium / Xanomeline and Dasatinib 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 Dasatinib interaction managed?
This is manageable. Keep taking both medicines exactly as prescribed unless your prescriber tells you otherwise. Your care team may monitor you more closely for dasatinib side effects, such as unusual tiredness, swelling, bruising or bleeding, stomach upset, or a fast or irregular heartbeat. The dasatinib dose may need to be adjusted and individualized by your team if side effects increase. Report… 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 Dasatinib 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 Dasatinib
Keep reading about Trospium / Xanomeline
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