Drug interactions
Tiotropium-olodaterol + Trihexyphenidyl
Severity: Moderate
Tiotropium-olodaterol 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
Trihexyphenidyl is a potent antimuscarinic, and combining it with tiotropium may increase anticholinergic effects. These include dry mouth, constipation, urinary retention, blurred vision, confusion and angle-closure glaucoma.
What this interaction means in plain words
Tiotropium-olodaterol 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.
Tiotropium-olodaterol belongs to Respiratory; Trihexyphenidyl belongs to Central Nervous System.
Why it happens
Additive antimuscarinic receptor blockade.
What to do
Monitor for anticholinergic toxicity, especially in older patients; use the lowest effective trihexyphenidyl 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 Tiotropium-olodaterol
Other interactions of Trihexyphenidyl
Frequently asked questions
Can I take Tiotropium-olodaterol with Trihexyphenidyl?
MediHelp rates the interaction as moderate. Tiotropium-olodaterol 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. Trihexyphenidyl is a potent antimuscarinic, and combining it with tiotropium may increase anticholinergic effects. These include dry mouth, constipation, urinary retention, blurred vision, confusion and angle-closure glaucoma.
How serious is the interaction between Tiotropium-olodaterol 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 toxicity, especially in older patients; use the lowest effective trihexyphenidyl dose.
What other medicines interact with Tiotropium-olodaterol?
MediHelp also lists interactions of Tiotropium-olodaterol with, for example, Amisulpride, Arformoterol, Arsenic trioxide. The full list is on the Tiotropium-olodaterol page.
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