Drug interactions
Benztropine + Chlorpromazine
Severity: Moderate
Benztropine and Chlorpromazine: 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
Chlorpromazine has significant anticholinergic activity, and benztropine adds to it. The combination can cause dry mouth, constipation, urinary retention, confusion, hyperthermia and impaired heat dissipation, particularly in older patients.
What this interaction means in plain words
Benztropine and Chlorpromazine 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.
Benztropine belongs to Central Nervous System; Chlorpromazine belongs to Central Nervous System.
Why it happens
Additive antimuscarinic effects.
What to do
Use benztropine only when extrapyramidal symptoms require it and at the lowest effective dose. Monitor for anticholinergic toxicity, cognitive changes and heat intolerance.
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 Benztropine and Chlorpromazine, 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 7 days on the web. No card needed.
Other interactions of Chlorpromazine
- Chlorpromazine + Dofetilide Contraindicated
- Chlorpromazine + Dronedarone Contraindicated
- Chlorpromazine + Droperidol Contraindicated
- Chlorpromazine + Ibutilide Contraindicated
- Chlorpromazine + Metrizamide Contraindicated
- Chlorpromazine + Panobinostat Contraindicated
Other interactions of Benztropine
- Benztropine + Memantine-donepezil Major
- Abobotulinumtoxina + Benztropine Moderate
- Amantadine + Benztropine Moderate
- Amitriptyline + Benztropine Moderate
- Amoxapine + Benztropine Moderate
- Atropine iv / + Benztropine Moderate
Frequently asked questions
Can I take Benztropine with Chlorpromazine?
MediHelp rates the interaction as moderate. Benztropine and Chlorpromazine 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. Chlorpromazine has significant anticholinergic activity, and benztropine adds to it. The combination can cause dry mouth, constipation, urinary retention, confusion, hyperthermia and impaired heat dissipation, particularly in older patients.
How serious is the interaction between Benztropine and Chlorpromazine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use benztropine only when extrapyramidal symptoms require it and at the lowest effective dose. Monitor for anticholinergic toxicity, cognitive changes and heat intolerance.
What other medicines interact with Chlorpromazine?
MediHelp also lists interactions of Chlorpromazine with, for example, Dofetilide, Dronedarone, Droperidol. The full list is on the Chlorpromazine 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.
