Combination

Mixing DayQuil and DXM (robo)

CombinationDissociative
Verdict

Caution · DXM twice

DayQuil and DXM both contain dextromethorphan (DXM), the cough suppressant. The doses add up, and above the label amount DXM stops acting like cough medicine: dizziness, vomiting, a fast heartbeat, confusion and feeling detached from your body.

  1. Take one of them, not both. "DM" in a product's name (Robitussin DM, Mucinex DM) means it contains DXM.
What “Caution” means

Can you take DayQuil with DXM?

DayQuil contains acetaminophen and DXM. DayQuil and DXM both contain dextromethorphan (DXM), the cough suppressant. The doses add up, and above the label amount DXM stops acting like cough medicine: dizziness, vomiting, a fast heartbeat, confusion and feeling detached from your body. MixSafe rates DayQuil with DXM as "Caution" — carries risk that is worth understanding before combining. Reduce doses and do not use alone. Sources: the Drug Facts labels on DailyMed. 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.

DXM twice

Caution

DayQuil + DXM

What to do
  1. 01Take one of them, not both."DM" in a product's name (Robitussin DM, Mucinex DM) means it contains DXM.
Signs it is happening
  1. Dizziness, vomiting, or feeling drunk or detached
  2. A fast heartbeat, sweating, or running hot
Why this happens

DayQuil and DXM both contain dextromethorphan (DXM), the cough suppressant.

The doses add up, and above the label amount DXM stops acting like cough medicine: dizziness, vomiting, a fast heartbeat, confusion and feeling detached from your body.

Sources

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.

Think this is wrong, or know a better source? Send it.

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