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 of these are an antihistamine. Webuse webmd’s drug interaction checker tool to find and identify potentially harmful and unsafe combinations of prescription medications by entering two or more drugs in question. Webvicks dayquil cold & flu relief is used to treat the following conditions: This combination medication is used to temporarily treat cough, stuffy nose, body aches, and other symptoms (such as fever, headache, sore.