Drug interactions
Droperidol + Trihexyphenidyl
Severity: Minor
Droperidol 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
Droperidol is a dopamine antagonist that can cause extrapyramidal symptoms, which trihexyphenidyl is often used to treat, so the pair is sometimes given intentionally. Droperidol has only weak anticholinergic activity, so the additive effect is small, but droperidol also prolongs the QT interval and sedation may be enhanced.
What this interaction means in plain words
Droperidol 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
Mainly pharmacodynamic: dopamine blockade offset by anticholinergic action, with slight additive antimuscarinic effects.
What to do
Use trihexyphenidyl only when extrapyramidal symptoms occur and monitor for anticholinergic effects and sedation; follow QT precautions for droperidol.
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 Droperidol with Trihexyphenidyl?
MediHelp rates the interaction as minor. Droperidol 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. Droperidol is a dopamine antagonist that can cause extrapyramidal symptoms, which trihexyphenidyl is often used to treat, so the pair is sometimes given intentionally. Droperidol has only weak anticholinergic activity, so the additive effect is small, but droperidol also prolongs the QT interval and sedation may be enhanced.
How serious is the interaction between Droperidol 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: Use trihexyphenidyl only when extrapyramidal symptoms occur and monitor for anticholinergic effects and sedation; follow QT precautions for droperidol.
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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