Drug interactions
Hyoscyamine spray + Tiotropium
Severity: Moderate
Hyoscyamine spray and Tiotropium: 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
Hyoscyamine is absorbed systemically after oral spray use and adds antimuscarinic load to inhaled tiotropium. This can produce dry mouth, constipation, urinary retention, blurred vision and tachycardia. Older patients and those with glaucoma or prostatic disease are at greater risk.
What this interaction means in plain words
Hyoscyamine spray and Tiotropium 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 antagonism at muscarinic receptors.
What to do
Avoid combining where an alternative exists. If both are used, monitor for anticholinergic adverse effects and lower the hyoscyamine dose if they occur.
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
Frequently asked questions
Can I take Hyoscyamine spray with Tiotropium?
MediHelp rates the interaction as moderate. Hyoscyamine spray and Tiotropium 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. Hyoscyamine is absorbed systemically after oral spray use and adds antimuscarinic load to inhaled tiotropium. This can produce dry mouth, constipation, urinary retention, blurred vision and tachycardia. Older patients and those with glaucoma or prostatic disease are at greater risk.
How serious is the interaction between Hyoscyamine spray and Tiotropium?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid combining where an alternative exists. If both are used, monitor for anticholinergic adverse effects and lower the hyoscyamine dose if they occur.
What other medicines interact with Tiotropium?
MediHelp also lists interactions of Tiotropium with, for example, Glycopyrrolate inhaled, Indacaterol-glycopyrronium, Revefenacin. The full list is on the Tiotropium page.
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