Drug interactions
Diphenoxylate-atropine + Hyoscyamine spray
Severity: Moderate
Diphenoxylate-atropine and Hyoscyamine spray: 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 have antimuscarinic activity, so combined use adds to anticholinergic effects such as dry mouth, urinary retention, constipation, blurred vision and tachycardia. The atropine content of diphenoxylate-atropine is small but the effect still adds to that of hyoscyamine, particularly in children and older adults.
What this interaction means in plain words
Diphenoxylate-atropine and Hyoscyamine spray 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 antagonism at muscarinic receptors.
What to do
Monitor for anticholinergic toxicity, including urinary retention, ileus and tachycardia, and reduce the hyoscyamine dose if symptoms appear. Avoid the combination in patients with obstructive bowel disease or glaucoma.
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 Hyoscyamine spray?
MediHelp rates the interaction as moderate. Diphenoxylate-atropine and Hyoscyamine spray 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 have antimuscarinic activity, so combined use adds to anticholinergic effects such as dry mouth, urinary retention, constipation, blurred vision and tachycardia. The atropine content of diphenoxylate-atropine is small but the effect still adds to that of hyoscyamine, particularly in children and older adults.
How serious is the interaction between Diphenoxylate-atropine and Hyoscyamine spray?
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 urinary retention, ileus and tachycardia, and reduce the hyoscyamine dose if symptoms appear. Avoid the combination in patients with obstructive bowel disease or glaucoma.
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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