Drug interactions
Bethanechol + Tiotropium
Severity: Moderate
Bethanechol and Tiotropium: 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 tiotropium a muscarinic antagonist, so each can reduce the effect of the other. The practical effect at inhaled tiotropium doses is likely small but could reduce bethanechol benefit on bladder emptying.
What this interaction means in plain words
Bethanechol and Tiotropium 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; Tiotropium belongs to Respiratory.
Why it happens
Pharmacodynamic antagonism at muscarinic receptors.
What to do
Monitor bethanechol response, such as urinary retention symptoms. Adjust the bethanechol dose if efficacy is reduced.
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 Tiotropium
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 Tiotropium?
MediHelp rates the interaction as moderate. Bethanechol and Tiotropium 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 tiotropium a muscarinic antagonist, so each can reduce the effect of the other. The practical effect at inhaled tiotropium doses is likely small but could reduce bethanechol benefit on bladder emptying.
How serious is the interaction between Bethanechol and Tiotropium?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor bethanechol response, such as urinary retention symptoms. Adjust the bethanechol dose if efficacy is reduced.
What other medicines interact with Tiotropium?
MediHelp also lists interactions of Tiotropium with, for example, Glycopyrrolate inhaled, Indacaterol-glycopyrronium, Revefenacin. The full list is on the Tiotropium page.
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