Mixing Diphenhydramine (Benadryl) and Zolpidem (Ambien)

Unsafe

Each makes the other stronger, so people pass out without warning and black out.

Do this

Avoid this combination beyond low medical doses. If someone passes out, put them on their side.

General answer for Benzodiazepines: nothing specific to these two is documented.

Where the risk isTap for why
In an emergency, call 911911Never Use AlonePoison Control
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.
What “Unsafe” means

Risk of serious physical or psychological harm. Not recommended under any circumstances.

How the ratings work
The longer explanation

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. Memory blackouts are likely. Low medical doses are unlikely to be of concern.

Sources (1)

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Other names
Diphenhydramine
benadryl, dph, sleep aid, zzzquil, unisom, doxylamine
Zolpidem
ambien, ambien cr, stilnox, edluar, intermezzo, zolpimist
Works like a benzo, plus sleepwalking and sleep-driving with no memory of it
Also searched asBenadryl and Ambien, dph and Ambien, Benadryl and ambien cr, dph and ambien cr
Add a third substance in the checker

Related combinations

Diphenhydramine withWhat not to mix with Diphenhydramine →
Zolpidem withWhat not to mix with Zolpidem →
All combinations →

Can you mix Diphenhydramine (Benadryl) and Zolpidem (Ambien)?

MixSafe rates mixing Diphenhydramine and Zolpidem as "Unsafe" — risk of serious physical or psychological harm. Not recommended under any circumstances. No interaction specific to Diphenhydramine and Zolpidem is documented; this is the default for Benzodiazepines. Source: TripSit drug combination chart, retrieved 2026-08-20. Educational information, not medical advice.

This is a class-level answer, inherited from Benzodiazepines. Nothing specific to this exact pair is documented, so treat it as the default for the class rather than a measurement of these two drugs together.