Webfind patient medical information for vicks dayquil oral on webmd including its uses, side effects and safety, interactions, pictures, warnings and user ratings. Webas mentioned, dayquil and zyrtec can be taken together and both may be recommended based on your symptoms. It is important to be aware however, the zyrtec. Webin most cases, it is safe to take zyrtec (cetirizine) the same day as taking nyquil. However, they generally should not be taken at the same time, or, at least. Dayquil has acetaminophen, dextromethorphan and phenylephrine in it, and none…