Drug interactions
Oxybutynin + Trospium chloride
Severity: Moderate
Oxybutynin and Trospium chloride: 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
Both are antimuscarinic bladder agents, so using them together duplicates therapy and increases anticholinergic adverse effects such as dry mouth, constipation, urinary retention and confusion.
What this interaction means in plain words
Oxybutynin and Trospium chloride 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.
Why it happens
Additive blockade of muscarinic receptors.
What to do
Avoid combining two antimuscarinic bladder agents; use one drug and optimize its dose or switch class.
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 Oxybutynin
Frequently asked questions
Can I take Oxybutynin with Trospium chloride?
MediHelp rates the interaction as moderate. Oxybutynin and Trospium chloride 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. Both are antimuscarinic bladder agents, so using them together duplicates therapy and increases anticholinergic adverse effects such as dry mouth, constipation, urinary retention and confusion.
How serious is the interaction between Oxybutynin and Trospium chloride?
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 two antimuscarinic bladder agents; use one drug and optimize its dose or switch class.
What other medicines interact with Oxybutynin?
MediHelp also lists interactions of Oxybutynin with, for example, Bethanechol, Clozapine, Potassium chloride. The full list is on the Oxybutynin page.
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