Drug interactions
Belladonna alkaloids + Haloperidol
Severity: Moderate
Belladonna alkaloids and Haloperidol: 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
Belladonna alkaloids (atropine, hyoscyamine, scopolamine) add to haloperidol's anticholinergic effects, which can cause confusion, tachycardia, urinary retention, constipation and heat intolerance. Older patients are especially vulnerable to delirium.
What this interaction means in plain words
Belladonna alkaloids and Haloperidol 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 pharmacodynamic effects.
What to do
Monitor for anticholinergic toxicity, including cognition, heart rate and urinary retention, and use the lowest effective doses. Consider a non-anticholinergic alternative in older adults.
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?
Pro+ members
Unlock the full page
Create an account and start a Pro+ trial to unlock the full management advice for Belladonna alkaloids and Haloperidol, the additional notes, the evidence detail and the whole-prescription interaction checker.
- Full clinical management advice
- Additional notes
- Evidence detail
- Interaction checker for a whole prescription
Try Pro+ free for 14 days on the web. No card needed.
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 Belladonna alkaloids with Haloperidol?
MediHelp rates the interaction as moderate. Belladonna alkaloids and Haloperidol 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. Belladonna alkaloids (atropine, hyoscyamine, scopolamine) add to haloperidol's anticholinergic effects, which can cause confusion, tachycardia, urinary retention, constipation and heat intolerance. Older patients are especially vulnerable to delirium.
How serious is the interaction between Belladonna alkaloids and Haloperidol?
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, including cognition, heart rate and urinary retention, and use the lowest effective doses. Consider a non-anticholinergic alternative in older adults.
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.
Full monographs, dosing and an interaction checker in the MediHelp app
Open the complete reference, check multi-drug interactions and use dosing tools in the MediHelp app.
