Drug interactions
Oxybutynin + Rivastigmine
Severity: Major
Oxybutynin and Rivastigmine: major 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
Rivastigmine, a cholinesterase inhibitor, and oxybutynin, a muscarinic antagonist, have opposing actions. Oxybutynin may reduce the cognitive benefit of rivastigmine and worsen confusion in dementia.
What this interaction means in plain words
Oxybutynin and Rivastigmine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Oxybutynin belongs to Genitourinary; Rivastigmine belongs to Central Nervous System.
Why it happens
Pharmacodynamic antagonism between cholinesterase inhibition and muscarinic receptor blockade.
What to do
Avoid oxybutynin in patients taking cholinesterase inhibitors; use a non-anticholinergic option such as mirabegron for bladder symptoms.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Oxybutynin
- Bethanechol + Oxybutynin Major
- Clozapine + Oxybutynin Major
- Oxybutynin + Potassium chloride Major
- Oxybutynin + Trihexyphenidyl Major
- Abobotulinumtoxina + Oxybutynin Moderate
- Aclidinium + Oxybutynin Moderate
Other interactions of Rivastigmine
Frequently asked questions
Can I take Oxybutynin with Rivastigmine?
MediHelp rates the interaction as major. Oxybutynin and Rivastigmine can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Rivastigmine, a cholinesterase inhibitor, and oxybutynin, a muscarinic antagonist, have opposing actions. Oxybutynin may reduce the cognitive benefit of rivastigmine and worsen confusion in dementia.
How serious is the interaction between Oxybutynin and Rivastigmine?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid oxybutynin in patients taking cholinesterase inhibitors; use a non-anticholinergic option such as mirabegron for bladder symptoms.
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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