Drug interactions
Belladonna alkaloids + Diphenoxylate-atropine
Severity: Moderate
Belladonna alkaloids and Diphenoxylate-atropine: 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 products contain antimuscarinic alkaloids, so combined use adds up anticholinergic effects. This can cause dry mouth, tachycardia, urinary retention, constipation, blurred vision, confusion and, in severe cases, ileus or heat intolerance.
What this interaction means in plain words
Belladonna alkaloids and Diphenoxylate-atropine 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 from atropine and belladonna alkaloids (atropine, hyoscyamine, scopolamine).
What to do
Avoid duplicate antimuscarinic therapy where possible. If both are needed, monitor for anticholinergic toxicity, particularly in older adults and those with glaucoma or urinary obstruction.
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 Belladonna alkaloids with Diphenoxylate-atropine?
MediHelp rates the interaction as moderate. Belladonna alkaloids and Diphenoxylate-atropine 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 products contain antimuscarinic alkaloids, so combined use adds up anticholinergic effects. This can cause dry mouth, tachycardia, urinary retention, constipation, blurred vision, confusion and, in severe cases, ileus or heat intolerance.
How serious is the interaction between Belladonna alkaloids and Diphenoxylate-atropine?
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 antimuscarinic therapy where possible. If both are needed, monitor for anticholinergic toxicity, particularly in older adults and those with glaucoma or urinary obstruction.
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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