Drug interactions
Diphenoxylate-atropine + Propantheline
Severity: Moderate
Diphenoxylate-atropine 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
Propantheline is an antimuscarinic that adds to the atropine in the combination product. Together they can cause marked dry mouth, urinary retention, tachycardia, blurred vision and severe constipation, with a risk of paralytic ileus.
What this interaction means in plain words
Diphenoxylate-atropine 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 muscarinic receptor antagonism.
What to do
Avoid duplicate anticholinergic therapy where possible; monitor for urinary retention, ileus, tachycardia and overheating. Reduce doses or choose an alternative if symptoms appear.
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 Diphenoxylate-atropine
- Diphenoxylate-atropine + Isocarboxazid Contraindicated
- Diphenoxylate-atropine + Phenelzine Contraindicated
- Diphenoxylate-atropine + Tranylcypromine Contraindicated
- Alfentanil + Diphenoxylate-atropine Major
- Alvimopan + Diphenoxylate-atropine Major
- Amitriptyline + Diphenoxylate-atropine Major
Frequently asked questions
Can I take Diphenoxylate-atropine with Propantheline?
MediHelp rates the interaction as moderate. Diphenoxylate-atropine 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. Propantheline is an antimuscarinic that adds to the atropine in the combination product. Together they can cause marked dry mouth, urinary retention, tachycardia, blurred vision and severe constipation, with a risk of paralytic ileus.
How serious is the interaction between Diphenoxylate-atropine 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: Avoid duplicate anticholinergic therapy where possible; monitor for urinary retention, ileus, tachycardia and overheating. Reduce doses or choose an alternative if symptoms appear.
What other medicines interact with Diphenoxylate-atropine?
MediHelp also lists interactions of Diphenoxylate-atropine with, for example, Isocarboxazid, Phenelzine, Tranylcypromine. The full list is on the Diphenoxylate-atropine page.
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