Mixing Cannabis (weed) and DayQuil
Low risk, increased effect
Low risk of harm, but the effects amplify each other. Doses that are fine alone can be far too much together.
Can you take Cannabis with DayQuil?
DayQuil contains acetaminophen and DXM. The most concerning part is Cannabis with DayQuil (DXM): each makes the other stronger, so weed can push a DXM trip much further than the dose alone would. Take less DXM than usual, and check the box: many cold medicines add acetaminophen or an antihistamine, dangerous at DXM doses. MixSafe rates Cannabis with DayQuil as "Low risk, increased effect" — low risk of harm, but the effects amplify each other. Doses that are fine alone can be far too much together. 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
Cannabis + DayQuil (DXM)Low risk, increased effect
Each makes the other stronger, so weed can push a DXM trip much further than the dose alone would. Take less DXM than usual, and check the box: many cold medicines add acetaminophen or an antihistamine, dangerous at DXM doses.
Low risk of harm, but the effects amplify each other. Doses that are fine alone can be far too much together.
Source: TripSit drug combination chart
Cannabis + DayQuil (Acetaminophen)Low risk, no synergy
Neither substance is expected to meaningfully change the other. Both still carry their own individual risks.
No specific interaction is documented. Acetaminophen's main risk is dose-dependent liver injury, so the thing to watch in any combination is total daily intake across all products (roughly 4g/24h) and anything else straining the liver.
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.
Think this is wrong, or know a better source? Send it.
Checking more than two?
The checker reads every ingredient in every box at once, and flags anything you would be taking twice.
Open this in the checker