Drug interactions
Hyoscyamine spray + Pimozide
Severity: Moderate
Hyoscyamine spray and Pimozide: 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
Oral hyoscyamine spray is absorbed through the oral mucosa and gut and has systemic antimuscarinic effects. Combined with pimozide's anticholinergic properties, it may cause dry mouth, constipation, urinary retention, tachycardia and confusion.
What this interaction means in plain words
Hyoscyamine spray and Pimozide 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 antimuscarinic effects.
What to do
Monitor for anticholinergic toxicity and use the lowest effective hyoscyamine dose, particularly in older patients.
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 Pimozide
- Adagrasib + Pimozide Contraindicated
- Amiodarone + Pimozide Contraindicated
- Amisulpride + Pimozide Contraindicated
- Amitriptyline + Pimozide Contraindicated
- Amoxapine + Pimozide Contraindicated
- Anagrelide + Pimozide Contraindicated
Frequently asked questions
Can I take Hyoscyamine spray with Pimozide?
MediHelp rates the interaction as moderate. Hyoscyamine spray and Pimozide 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. Oral hyoscyamine spray is absorbed through the oral mucosa and gut and has systemic antimuscarinic effects. Combined with pimozide's anticholinergic properties, it may cause dry mouth, constipation, urinary retention, tachycardia and confusion.
How serious is the interaction between Hyoscyamine spray and Pimozide?
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 and use the lowest effective hyoscyamine dose, particularly in older patients.
What other medicines interact with Pimozide?
MediHelp also lists interactions of Pimozide with, for example, Adagrasib, Amiodarone, Amisulpride. The full list is on the Pimozide page.
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