Drug interactions
Bethanechol + Trospium
Severity: Moderate
Bethanechol and Trospium: moderate interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Bethanechol is a muscarinic agonist and trospium is a muscarinic antagonist, so they directly oppose each other. The effect of bethanechol on bladder emptying may be reduced, and the combination is therapeutically counterproductive.
What this interaction means in plain words
Bethanechol and Trospium can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Bethanechol belongs to Gastrointestinal Tract; Trospium belongs to Genitourinary.
Why it happens
Direct pharmacodynamic antagonism at muscarinic receptors.
What to do
Avoid combining where possible. If used together, monitor for loss of bethanechol effect such as persistent urinary retention.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Trospium
- Clozapine + Trospium Major
- Pramlintide + Trospium Major
- Thioridazine + Trospium Major
- Trihexyphenidyl + Trospium Major
- Aclidinium + Trospium Moderate
- Amantadine + Trospium Moderate
Other interactions of Bethanechol
- Bethanechol + Darifenacin Major
- Bethanechol + Fesoterodine Major
- Bethanechol + Oxybutynin Major
- Bethanechol + Physostigmine Major
- Amifampridine + Bethanechol Moderate
- Amitriptyline + Bethanechol Moderate
Frequently asked questions
Can I take Bethanechol with Trospium?
MediHelp rates the interaction as moderate. Bethanechol and Trospium can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Bethanechol is a muscarinic agonist and trospium is a muscarinic antagonist, so they directly oppose each other. The effect of bethanechol on bladder emptying may be reduced, and the combination is therapeutically counterproductive.
How serious is the interaction between Bethanechol and Trospium?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid combining where possible. If used together, monitor for loss of bethanechol effect such as persistent urinary retention.
What other medicines interact with Trospium?
MediHelp also lists interactions of Trospium with, for example, Clozapine, Pramlintide, Thioridazine. The full list is on the Trospium page.
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