Drug interactions
Glycopyrrolate inhaled + Trihexyphenidyl
Severity: Minor
Glycopyrrolate inhaled and Trihexyphenidyl: minor 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
Inhaled glycopyrrolate has low systemic exposure, but it can still add to the systemic antimuscarinic effects of trihexyphenidyl. Patients may notice more dry mouth, constipation, urinary retention or worsening of narrow-angle glaucoma.
What this interaction means in plain words
Glycopyrrolate inhaled and Trihexyphenidyl have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Why it happens
Additive muscarinic antagonism, limited by low systemic absorption of the inhaled drug.
What to do
Monitor for urinary retention, constipation and eye symptoms, particularly in patients with glaucoma or prostatic hypertrophy.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Trihexyphenidyl
Frequently asked questions
Can I take Glycopyrrolate inhaled with Trihexyphenidyl?
MediHelp rates the interaction as minor. Glycopyrrolate inhaled and Trihexyphenidyl have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Inhaled glycopyrrolate has low systemic exposure, but it can still add to the systemic antimuscarinic effects of trihexyphenidyl. Patients may notice more dry mouth, constipation, urinary retention or worsening of narrow-angle glaucoma.
How serious is the interaction between Glycopyrrolate inhaled and Trihexyphenidyl?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for urinary retention, constipation and eye symptoms, particularly in patients with glaucoma or prostatic hypertrophy.
What other medicines interact with Trihexyphenidyl?
MediHelp also lists interactions of Trihexyphenidyl with, for example, Orphenadrin, Oxybutynin, Scopolamine. The full list is on the Trihexyphenidyl page.
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