MAJOR — Use With Caution
DANGEROUS — additive respiratory depression
Evidence level: STRONG
Combining Benadryl with oxycodone is dangerous — both suppress breathing.
Additive CNS and respiratory depression. Antihistamine sedation compounds opioid effects.
Avoid. Use non-sedating antihistamines if needed.
Take Oxycodone exactly as prescribed — set alarms for scheduled doses. Diphenhydramine follows its normal schedule. Opioids slow GI transit, which can affect absorption of other medications. Take with food if nausea occurs. Never combine with alcohol.
Elderly, respiratory conditions, concurrent alcohol, high opioid doses
Extreme drowsiness, shallow breathing, confusion, loss of consciousness
Inform doctor about all OTC medications while on opioids.
Opioid combinations carry serious risks including respiratory depression. Talk to your pain management specialist about non-opioid alternatives: physical therapy, NSAIDs (if appropriate), nerve blocks, or non-sedating supplements like PEA (palmitoylethanolamide) or curcumin for inflammation.
Combining Benadryl with oxycodone is dangerous — both suppress breathing.
Take Oxycodone exactly as prescribed — set alarms for scheduled doses. Diphenhydramine follows its normal schedule. Opioids slow GI transit, which can affect absorption of other medications. Take with food if nausea occurs. Never combine with alcohol.
Extreme drowsiness, shallow breathing, confusion, loss of consciousness
Opioid combinations carry serious risks including respiratory depression. Talk to your pain management specialist about non-opioid alternatives: physical therapy, NSAIDs (if appropriate), nerve blocks, or non-sedating supplements like PEA (palmitoylethanolamide) or curcumin for inflammation.
Inform doctor about all OTC medications while on opioids.
Or browse the full interaction database (121,000+ pairs).