Mixing Advil PM and Ketamine (ket)
Dangerous
High risk of death or life-changing injury. Do not combine.
What to do
- Say what was taken and how much.Responders need it, and in most US states Good Samaritan laws protect both of you from drug possession charges when you call for an overdose.
- Unresponsive: put them on their side, tilt the head back, and stay until help arrives.Never leave someone alone to “sleep it off”.
- Never Use Alone 1-800-484-3731Stays on the line and sends help if you stop responding.
- Full steps: what to do if it is already happeningOverdose signs, the recovery position, what to say on the call, and whether you can be charged for making it.
- Poison Control 1-800-222-1222Free and 24/7, for “is this bad?” before it becomes an emergency.
Can you take Advil PM with Ketamine?
Advil PM contains ibuprofen and diphenhydramine. The most concerning part is Advil PM (Diphenhydramine) with Ketamine: each makes the other stronger: people pass out without warning, and ketamine can push diphenhydramine into delirium. Do not combine at recreational doses. If someone passes out, put them on their side. MixSafe rates Advil PM with Ketamine as "Dangerous" — high risk of death or life-changing injury. Do not combine. Sources: the Drug Facts labels on DailyMed, the TripSit combination chart and MixSafe research. Educational information, not medical advice.
What is in it
- Advil PM
- Ibuprofen + Diphenhydramine.
Ingredient by ingredient
Advil PM (Diphenhydramine) + KetamineDangerous
Each makes the other stronger: people pass out without warning, and ketamine can push diphenhydramine into delirium. Do not combine at recreational doses. If someone passes out, put them on their side.
Both substances potentiate the ataxia and sedation caused by the other and can lead to unexpected loss of consciousness at high doses. While unconscious, vomit aspiration is a risk if not placed in the recovery position. Ketamine has a high likelihood of increasing DPH's deliriant effects at higher dosages and can greatly increase the risk of injury, mania, and psychosis. Medical dosages of both substances are unlikely to cause concern.
Source: TripSit drug combination chart
Advil PM (Ibuprofen) + KetamineLow risk, no synergy
Neither substance is expected to meaningfully change the other. Both still carry their own individual risks.
No specific interaction is documented. Ibuprofen's standing risks — stomach bleeding and reduced kidney blood flow — apply in any combination, and matter most when dehydrated, not eating, or dosing repeatedly over a long session.
Sources: Ibuprofen and Alcohol: Is it Safe to Mix NSAIDs and Alcohol? · Mixing NSAIDs with alcohol. GoodRx · Ibuprofen interactions to avoid. SingleCare
- Advil PM, Drug Facts label. DailyMed. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=658fc201-47c9-6a6d-8af9-6208298d43b4
Ingredient lists checked 2026-09-27. Formulas change and store brands differ, so the Drug Facts box on your own packet is the final word.
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