Trospium / Xanomeline and Aclidinium: 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
Aclidinium
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.
Both of these medicines have what we call anticholinergic effects. Aclidinium (Tudorza) is an inhaler that helps your breathing, and the trospium part of Cobenfy also works this way. When you take two medicines that act the same way, their side effects can stack up.
That means you might notice more dry mouth, constipation, blurry vision, or trouble emptying your bladder. This is a theoretical concern, so it may not happen to everyone. The good news is your care team can watch for these effects and adjust things if needed. Let your pharmacist or doctor know if any of these bother you.
Mechanism: Additive antimuscarinic (anticholinergic) effects. Aclidinium is an inhaled long-acting muscarinic antagonist; trospium is a peripheral muscarinic antagonist (xanomeline is a muscarinic agonist paired with trospium to limit peripheral effects). Neither is a prodrug relevant here; this is a pharmacodynamic, not pharmacokinetic, interaction.
- Direction: Increased cumulative anticholinergic burden.
- Effects: Dry mouth, constipation, urinary retention, blurred vision, tachycardia.
- Onset: Unspecified.
- Evidence: Theoretical.
- Management: If coadministered, monitor for increased frequency/severity of anticholinergic reactions; dose may be individualized by the care team.
What happens
An increased risk of anticholinergic adverse reactions (eg, dry mouth, constipation)
Interaction Deep Dive
Taking trospium/xanomeline together with other antimuscarinic agents that cause anticholinergic side effects (for example, dry mouth and constipation) can raise how often and/or how severely these reactions occur. When these medications are given together, watch patients for any rise in the frequency and/or intensity of anticholinergic adverse reactions1.
Why it happens (mechanism)
Additive antimuscarinic effects
How to manage this interaction
Here is what typically happens and what you can do:
- Keep taking both as prescribed unless your prescriber tells you otherwise.
- Your care team may monitor you more closely for anticholinergic side effects like dry mouth, constipation, blurred vision, or difficulty urinating.
- If side effects show up, your team may adjust and individualize your regimen.
- Report new or worsening constipation, trouble urinating, or vision changes to your pharmacist or doctor.
Simple comfort steps like staying hydrated and adding fiber can help with dry mouth and constipation, but check with your pharmacist first.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Trospium / Xanomeline and Aclidinium together?
Taking aclidinium with trospium/xanomeline can add up their anticholinergic side effects like dry mouth and constipation, so watch for these and tell your care team if they bother you. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Trospium / Xanomeline and Aclidinium 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 Aclidinium interaction managed?
Here is what typically happens and what you can do: Keep taking both as prescribed unless your prescriber tells you otherwise. Your care team may monitor you more closely for anticholinergic side effects like dry mouth, constipation, blurred vision, or difficulty urinating. If side effects show up, your team may adjust and individualize your regimen. Report new or worsening constipation, trouble u… 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 Aclidinium 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
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Keep reading about Trospium / Xanomeline
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