Drug interactions
Glycopyrronium tosylate + Trihexyphenidyl
Severity: Moderate
Glycopyrronium tosylate and Trihexyphenidyl: 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
Topical glycopyrronium has some systemic absorption and can add anticholinergic effects to trihexyphenidyl. This may cause dry mouth, blurred vision, urinary retention and constipation.
What this interaction means in plain words
Glycopyrronium tosylate and Trihexyphenidyl 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 effects, particularly in older adults, and reduce or stop one agent if they appear.
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 Trihexyphenidyl
Frequently asked questions
Can I take Glycopyrronium tosylate with Trihexyphenidyl?
MediHelp rates the interaction as moderate. Glycopyrronium tosylate and Trihexyphenidyl 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. Topical glycopyrronium has some systemic absorption and can add anticholinergic effects to trihexyphenidyl. This may cause dry mouth, blurred vision, urinary retention and constipation.
How serious is the interaction between Glycopyrronium tosylate and Trihexyphenidyl?
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 effects, particularly in older adults, and reduce or stop one agent if they appear.
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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