Drug interactions
Glycopyrronium + Protriptyline
Severity: Moderate
Glycopyrronium and Protriptyline: 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
Protriptyline is a tricyclic antidepressant with strong anticholinergic activity, so combining it with glycopyrronium increases antimuscarinic burden. This can cause constipation, urinary retention, dry mouth, tachycardia and, in susceptible patients, confusion or raised intraocular pressure.
What this interaction means in plain words
Glycopyrronium and Protriptyline 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 muscarinic receptor antagonism; any effect on glycopyrronium exposure is not well established.
What to do
Monitor for anticholinergic toxicity such as urinary retention, constipation and tachycardia. Use caution in elderly patients and those with glaucoma or prostatic hypertrophy, and lower doses if symptoms develop.
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 Glycopyrronium
- Clozapine + Glycopyrronium Major
- Abobotulinumtoxina + Glycopyrronium Moderate
- Aclidinium + Glycopyrronium Moderate
- Amantadine + Glycopyrronium Moderate
- Amitriptyline + Glycopyrronium Moderate
- Amoxapine + Glycopyrronium Moderate
Frequently asked questions
Can I take Glycopyrronium with Protriptyline?
MediHelp rates the interaction as moderate. Glycopyrronium and Protriptyline 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. Protriptyline is a tricyclic antidepressant with strong anticholinergic activity, so combining it with glycopyrronium increases antimuscarinic burden. This can cause constipation, urinary retention, dry mouth, tachycardia and, in susceptible patients, confusion or raised intraocular pressure.
How serious is the interaction between Glycopyrronium and Protriptyline?
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 toxicity such as urinary retention, constipation and tachycardia. Use caution in elderly patients and those with glaucoma or prostatic hypertrophy, and lower doses if symptoms develop.
What other medicines interact with Glycopyrronium?
MediHelp also lists interactions of Glycopyrronium with, for example, Clozapine, Abobotulinumtoxina, Aclidinium. The full list is on the Glycopyrronium page.
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