Drug interactions
Chlorpromazine + Propantheline
Severity: Moderate
Chlorpromazine 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 agents have anticholinergic activity, so combining them can cause dry mouth, constipation, urinary retention, blurred vision, confusion and tachycardia, particularly in older adults. Reduced gut motility from propantheline may also reduce oral chlorpromazine absorption.
What this interaction means in plain words
Chlorpromazine 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 and delayed gastric emptying that may reduce chlorpromazine absorption.
What to do
Monitor for anticholinergic toxicity and reduced antipsychotic response. Consider lowering the anticholinergic burden, especially in elderly 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 Chlorpromazine
- Chlorpromazine + Dofetilide Contraindicated
- Chlorpromazine + Dronedarone Contraindicated
- Chlorpromazine + Droperidol Contraindicated
- Chlorpromazine + Ibutilide Contraindicated
- Chlorpromazine + Metrizamide Contraindicated
- Chlorpromazine + Panobinostat Contraindicated
Frequently asked questions
Can I take Chlorpromazine with Propantheline?
MediHelp rates the interaction as moderate. Chlorpromazine 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 agents have anticholinergic activity, so combining them can cause dry mouth, constipation, urinary retention, blurred vision, confusion and tachycardia, particularly in older adults. Reduced gut motility from propantheline may also reduce oral chlorpromazine absorption.
How serious is the interaction between Chlorpromazine 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 and reduced antipsychotic response. Consider lowering the anticholinergic burden, especially in elderly patients.
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.
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