Drug interactions
Trihexyphenidyl + Trimipramine
Severity: Moderate
Trihexyphenidyl and Trimipramine: 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
Both drugs have antimuscarinic effects, so combining them can cause dry mouth, constipation, urinary retention, blurred vision, confusion and tachycardia. Older patients are at particular risk of delirium and heat intolerance.
What this interaction means in plain words
Trihexyphenidyl and Trimipramine 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.
Trihexyphenidyl belongs to Central Nervous System; Trimipramine belongs to Central Nervous System.
Why it happens
Additive antimuscarinic receptor blockade.
What to do
Monitor for anticholinergic toxicity, especially in older adults, and use the lowest effective doses. Choose a less anticholinergic antidepressant if symptoms develop.
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 Trimipramine
- Disopyramide + Trimipramine Contraindicated
- Dofetilide + Trimipramine Contraindicated
- Ibutilide + Trimipramine Contraindicated
- Isocarboxazid + Trimipramine Contraindicated
- Pentamidine + Trimipramine Contraindicated
- Phenelzine + Trimipramine Contraindicated
Other interactions of Trihexyphenidyl
Frequently asked questions
Can I take Trihexyphenidyl with Trimipramine?
MediHelp rates the interaction as moderate. Trihexyphenidyl and Trimipramine 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. Both drugs have antimuscarinic effects, so combining them can cause dry mouth, constipation, urinary retention, blurred vision, confusion and tachycardia. Older patients are at particular risk of delirium and heat intolerance.
How serious is the interaction between Trihexyphenidyl and Trimipramine?
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 toxicity, especially in older adults, and use the lowest effective doses. Choose a less anticholinergic antidepressant if symptoms develop.
What other medicines interact with Trimipramine?
MediHelp also lists interactions of Trimipramine with, for example, Disopyramide, Dofetilide, Ibutilide. The full list is on the Trimipramine page.
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