MAJOR — Use With Caution
DANGEROUS — additive respiratory depression risk
Evidence level: STRONG
Combining Benadryl with hydrocodone is dangerous — both suppress breathing and cause severe drowsiness.
Additive CNS and respiratory depression. Antihistamine sedation compounds opioid respiratory depression.
Avoid this combination. If antihistamine needed, use non-sedating options at lowest dose.
Take Hydrocodone 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, sleep apnea
Extreme drowsiness, shallow/slow breathing, confusion, loss of consciousness
Tell your doctor you are on opioids before taking any OTC sleep/allergy medications.
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 hydrocodone is dangerous — both suppress breathing and cause severe drowsiness.
Take Hydrocodone 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/slow 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.
Tell your doctor you are on opioids before taking any OTC sleep/allergy medications.
Or browse the full interaction database (121,000+ pairs).