Drug interactions
Caffeine + Diphenoxylate
Severity: Minor
Caffeine and Diphenoxylate: 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
Caffeine may blunt drowsiness from diphenoxylate, an opioid antidiarrheal, but this has little clinical consequence. Overdose-related CNS and respiratory depression is not prevented by caffeine.
What this interaction means in plain words
Caffeine and Diphenoxylate have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Caffeine belongs to Miscellaneous; Diphenoxylate belongs to Gastrointestinal Tract.
Why it happens
Opposing pharmacodynamic effects on CNS arousal; no established pharmacokinetic interaction.
What to do
No dose change is needed; keep diphenoxylate within labeled doses and watch for sedation, especially in children.
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 Caffeine
- Caffeine + Ephedrine Major
- Caffeine + Fezolinetant Major
- Caffeine + Methylenedioxymethamphetamine Major
- Caffeine + Selegiline transdermal Major
- Adenosine + Caffeine Moderate
- Benzphetamine + Caffeine Moderate
Other interactions of Diphenoxylate
Frequently asked questions
Can I take Caffeine with Diphenoxylate?
MediHelp rates the interaction as minor. Caffeine and Diphenoxylate have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Caffeine may blunt drowsiness from diphenoxylate, an opioid antidiarrheal, but this has little clinical consequence. Overdose-related CNS and respiratory depression is not prevented by caffeine.
How serious is the interaction between Caffeine and Diphenoxylate?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No dose change is needed; keep diphenoxylate within labeled doses and watch for sedation, especially in children.
What other medicines interact with Caffeine?
MediHelp also lists interactions of Caffeine with, for example, Ephedrine, Fezolinetant, Methylenedioxymethamphetamine. The full list is on the Caffeine page.
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