You will get a doubling up of some of the medicines in these two medications. You can take the theraflu at night and the dayquil during the day, 12 hour apart and that will give your body time for the levels of acetaminophen, decongestant and anti histamines to diminish, so that you won't have a double dose in you.
- DayQuil Drug Information
- Acetaminophen Drug Information
- Dextromethorphan Drug Information
- Pseudoephedrine Drug Information
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