Drug interactions
Diphenoxylate + Fluphenazine
Severity: Minor
Diphenoxylate and Fluphenazine: minor 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
Diphenoxylate is an opioid and, at higher doses, may add to the sedative effect of fluphenazine. Drowsiness and impaired alertness are the most likely consequences, and fluphenazine's anticholinergic effects may also add to constipating effects.
What this interaction means in plain words
Diphenoxylate and Fluphenazine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Diphenoxylate belongs to Gastrointestinal Tract; Fluphenazine belongs to Central Nervous System.
Why it happens
Additive CNS depression and anticholinergic effects.
What to do
Monitor for sedation and avoid exceeding recommended diphenoxylate doses.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Fluphenazine
- Arsenic trioxide + Fluphenazine Contraindicated
- Dofetilide + Fluphenazine Contraindicated
- Fluphenazine + Ibutilide Contraindicated
- Fluphenazine + Pimozide Contraindicated
- Adagrasib + Fluphenazine Major
- Alfentanil + Fluphenazine Major
Other interactions of Diphenoxylate
Frequently asked questions
Can I take Diphenoxylate with Fluphenazine?
MediHelp rates the interaction as minor. Diphenoxylate and Fluphenazine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Diphenoxylate is an opioid and, at higher doses, may add to the sedative effect of fluphenazine. Drowsiness and impaired alertness are the most likely consequences, and fluphenazine's anticholinergic effects may also add to constipating effects.
How serious is the interaction between Diphenoxylate and Fluphenazine?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor for sedation and avoid exceeding recommended diphenoxylate doses.
What other medicines interact with Fluphenazine?
MediHelp also lists interactions of Fluphenazine with, for example, Arsenic trioxide, Dofetilide, Ibutilide. The full list is on the Fluphenazine page.
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