Drug interactions
Ipratropium-salbutamol + Trihexyphenidyl
Severity: Minor
Ipratropium-salbutamol 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
Trihexyphenidyl is a strongly anticholinergic drug, and inhaled ipratropium may add to this. Because ipratropium has little systemic absorption, the extra effect is usually small, but it may contribute to dry mouth, urinary retention, constipation or blurred vision, and nebulised ipratropium can worsen angle-closure glaucoma.
What this interaction means in plain words
Ipratropium-salbutamol 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.
Ipratropium-salbutamol belongs to Respiratory; Trihexyphenidyl belongs to Central Nervous System.
Why it happens
Additive muscarinic receptor blockade, limited by low systemic exposure to inhaled ipratropium.
What to do
Monitor for anticholinergic effects such as urinary retention and eye pain, particularly in elderly patients or those with glaucoma or prostatic enlargement. Protect the eyes from nebulised ipratropium mist.
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 Ipratropium-salbutamol
Other interactions of Trihexyphenidyl
Frequently asked questions
Can I take Ipratropium-salbutamol with Trihexyphenidyl?
MediHelp rates the interaction as minor. Ipratropium-salbutamol 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. Trihexyphenidyl is a strongly anticholinergic drug, and inhaled ipratropium may add to this. Because ipratropium has little systemic absorption, the extra effect is usually small, but it may contribute to dry mouth, urinary retention, constipation or blurred vision, and nebulised ipratropium can worsen angle-closure glaucoma.
How serious is the interaction between Ipratropium-salbutamol 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 anticholinergic effects such as urinary retention and eye pain, particularly in elderly patients or those with glaucoma or prostatic enlargement. Protect the eyes from nebulised ipratropium mist.
What other medicines interact with Ipratropium-salbutamol?
MediHelp also lists interactions of Ipratropium-salbutamol with, for example, Amisulpride, Arsenic trioxide, Carvedilol. The full list is on the Ipratropium-salbutamol page.
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