Drug interactions
Atropine iv / + Trihexyphenidyl
Severity: Moderate
Atropine iv / 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
Atropine given by injection is a potent antimuscarinic, and with trihexyphenidyl the effects add together. Tachycardia, dry mouth, urinary retention, hyperthermia, confusion and agitation may result, particularly in older patients or at higher atropine doses.
What this interaction means in plain words
Atropine iv / 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 muscarinic receptor antagonism.
What to do
Monitor heart rate, temperature and mental status when atropine is given to a patient on trihexyphenidyl. Use the lowest effective atropine dose.
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 Atropine iv / with Trihexyphenidyl?
MediHelp rates the interaction as moderate. Atropine iv / 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. Atropine given by injection is a potent antimuscarinic, and with trihexyphenidyl the effects add together. Tachycardia, dry mouth, urinary retention, hyperthermia, confusion and agitation may result, particularly in older patients or at higher atropine doses.
How serious is the interaction between Atropine iv / 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 heart rate, temperature and mental status when atropine is given to a patient on trihexyphenidyl. Use the lowest effective atropine dose.
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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