Drug interactions
Diphenoxylate-atropine + Zotepine
Severity: Moderate
Diphenoxylate-atropine and Zotepine: 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
Zotepine is a sedating antipsychotic with strong anticholinergic properties, so combining it with diphenoxylate-atropine increases the risk of sedation and anticholinergic toxicity including constipation, urinary retention and confusion. Slowed gut transit may also alter oral zotepine absorption. Zotepine also lowers the seizure threshold.
What this interaction means in plain words
Diphenoxylate-atropine and Zotepine 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 CNS depression and anticholinergic effects, with possible changes in oral absorption from reduced gastrointestinal motility.
What to do
Monitor for oversedation, anticholinergic symptoms and bowel function. Use the lowest effective doses and avoid prolonged coadministration.
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 Zotepine?
MediHelp rates the interaction as moderate. Diphenoxylate-atropine and Zotepine 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. Zotepine is a sedating antipsychotic with strong anticholinergic properties, so combining it with diphenoxylate-atropine increases the risk of sedation and anticholinergic toxicity including constipation, urinary retention and confusion. Slowed gut transit may also alter oral zotepine absorption. Zotepine also lowers the seizure threshold.
How serious is the interaction between Diphenoxylate-atropine and Zotepine?
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 oversedation, anticholinergic symptoms and bowel function. Use the lowest effective doses and avoid prolonged coadministration.
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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