Drug interactions
Nortriptyline + Oxybutynin transdermal
Severity: Moderate
Nortriptyline and Oxybutynin transdermal: 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 drugs block muscarinic receptors, so use together may add to dry mouth, constipation, urinary retention, blurred vision and cognitive effects. Transdermal delivery gives lower levels of the active metabolite than oral oxybutynin, but additive effects remain possible.
What this interaction means in plain words
Nortriptyline and Oxybutynin transdermal 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 antimuscarinic effects.
What to do
Monitor for anticholinergic symptoms and confusion, particularly in older adults. Reduce dose or choose a less anticholinergic option if symptoms occur.
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 Nortriptyline
- Disopyramide + Nortriptyline Contraindicated
- Dofetilide + Nortriptyline Contraindicated
- Dronedarone + Nortriptyline Contraindicated
- Ibutilide + Nortriptyline Contraindicated
- Isocarboxazid + Nortriptyline Contraindicated
- Methylene blue + Nortriptyline Contraindicated
Frequently asked questions
Can I take Nortriptyline with Oxybutynin transdermal?
MediHelp rates the interaction as moderate. Nortriptyline and Oxybutynin transdermal 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 drugs block muscarinic receptors, so use together may add to dry mouth, constipation, urinary retention, blurred vision and cognitive effects. Transdermal delivery gives lower levels of the active metabolite than oral oxybutynin, but additive effects remain possible.
How serious is the interaction between Nortriptyline and Oxybutynin transdermal?
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 for anticholinergic symptoms and confusion, particularly in older adults. Reduce dose or choose a less anticholinergic option if symptoms occur.
What other medicines interact with Nortriptyline?
MediHelp also lists interactions of Nortriptyline with, for example, Disopyramide, Dofetilide, Dronedarone. The full list is on the Nortriptyline page.
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