Mixing Alcohol and DayQuil
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 Alcohol with DayQuil?
DayQuil contains acetaminophen and DXM. The most concerning part is Alcohol with DayQuil (DXM): each makes the other stronger: you can lose coordination, pass out without warning, and have trouble breathing. Do not combine, and never above the lowest recreational (first-plateau) dose of DXM. Put anyone who passes out on their side. MixSafe rates Alcohol with DayQuil 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
- DayQuil
- Acetaminophen + DXM. DayQuil also contains phenylephrine, a decongestant, and DayQuil Severe adds guaifenesin, an expectorant. MixSafe has no data for either.
Ingredient by ingredient
Alcohol + DayQuil (DXM)Dangerous
Each makes the other stronger: you can lose coordination, pass out without warning, and have trouble breathing. Do not combine, and never above the lowest recreational (first-plateau) dose of DXM. Put anyone who passes out 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. Place the affected individual in the recovery position to prevent vomit aspiration from excess. Additionally, CNS depression can lead to difficulty breathing. Avoid on anything higher than 1st plateau.
Source: TripSit drug combination chart
Alcohol + DayQuil (Acetaminophen)Caution
Alcohol makes acetaminophen harder on the liver, most of all for regular drinkers and while alcohol is clearing. Do not take repeated doses while drinking heavily.
Alcohol induces CYP2E1 and depletes the liver's glutathione, so more acetaminophen is converted to NAPQI, the metabolite that causes liver injury. Risk is highest for regular drinkers and when acetaminophen is taken as alcohol clears rather than during drinking. Occasional standard doses alongside light drinking are generally tolerated; repeated dosing while drinking heavily is how people end up in liver failure.
Sources: Prescott LF. Paracetamol, alcohol and the liver. Br J Clin Pharmacol. 2000 · Acetaminophen: A Liver Killer or Thriller
- Vicks DayQuil Cold & Flu LiquiCaps, Drug Facts label. DailyMed. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=efb982d4-93d0-815f-e053-2995a90a82dd
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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