Drug interactions
Haloperidol + Propantheline
Severity: Moderate
Haloperidol and Propantheline: 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 activity, so together they can cause dry mouth, constipation, urinary retention, blurred vision and confusion. Anticholinergics may also reduce oral haloperidol absorption and worsen psychosis in some patients.
What this interaction means in plain words
Haloperidol and Propantheline 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, particularly in older adults, and reduce the dose or choose alternatives 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 Haloperidol
- Dofetilide + Haloperidol Contraindicated
- Dronedarone + Haloperidol Contraindicated
- Haloperidol + Ibutilide Contraindicated
- Haloperidol + Levoketoconazole Contraindicated
- Haloperidol + Panobinostat Contraindicated
- Haloperidol + Pimozide Contraindicated
Frequently asked questions
Can I take Haloperidol with Propantheline?
MediHelp rates the interaction as moderate. Haloperidol and Propantheline 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 activity, so together they can cause dry mouth, constipation, urinary retention, blurred vision and confusion. Anticholinergics may also reduce oral haloperidol absorption and worsen psychosis in some patients.
How serious is the interaction between Haloperidol and Propantheline?
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, particularly in older adults, and reduce the dose or choose alternatives if symptoms develop.
What other medicines interact with Haloperidol?
MediHelp also lists interactions of Haloperidol with, for example, Dofetilide, Dronedarone, Ibutilide. The full list is on the Haloperidol page.
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