Drug interactions
Diphenhydramine + Dipipanone
Severity: Major
Diphenhydramine and Dipipanone: major interaction.
Last updated Sources: US FDA label
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
Dipipanone is an opioid analgesic, and diphenhydramine is a sedating antihistamine. Combined use increases drowsiness and may cause respiratory depression, especially in opioid-naive, older or frail patients. Impaired alertness also raises the risk of falls and accidents.
What this interaction means in plain words
Diphenhydramine and Dipipanone can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Why it happens
Additive central nervous system and respiratory depression from opioid agonism and central H1 blockade.
What to do
Use the lowest effective doses of both drugs and monitor sedation and respiratory rate. Choose a non-sedating antihistamine where appropriate.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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References
Other interactions of Diphenhydramine
Frequently asked questions
Can I take Diphenhydramine with Dipipanone?
MediHelp rates the interaction as major. Diphenhydramine and Dipipanone can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. Dipipanone is an opioid analgesic, and diphenhydramine is a sedating antihistamine. Combined use increases drowsiness and may cause respiratory depression, especially in opioid-naive, older or frail patients. Impaired alertness also raises the risk of falls and accidents.
How serious is the interaction between Diphenhydramine and Dipipanone?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Use the lowest effective doses of both drugs and monitor sedation and respiratory rate. Choose a non-sedating antihistamine where appropriate.
What other medicines interact with Diphenhydramine?
MediHelp also lists interactions of Diphenhydramine with, for example, Alfentanil, Belladonna and opium, Benzhydrocodone / acetaminophen. The full list is on the Diphenhydramine page.
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