I am sick and i just took advil cold and sinus 3 hours ago. how soon can i take nyquil?

8 hours.: Taking either one of them would be enough unless you want to be drowsy . Nyquil Cold And Flu (Acetaminophen / Dextromethorphan / Doxylamine) Advil Cold And Sinus (Ibuprofen / Pseudoephedrine) is a good combination medicine to relieve pain and congestion, but it's more medicine than you need if you only have one symptom.

Anytime: These two medications should not affect one another. However, taking both products may be more than you may need. Because those brands may include different combinations of drugs in different products with the same name (“Advil” and “Nyquil”), check the ingredient listing to be absolutely sure there isn’t any duplication - usually, the box will tell you what each ingredient is for.