1. DayQuil/NyQuil Severe Cold and Flu and Zyrtec Interactions - Drugs.comUsing dextromethorphan together with doxylamine may increase side effects such as dizziness, drowsiness, confusion, and difficulty concentrating.A Moderate Drug Interaction exists between DayQuil/NyQuil Severe Cold and Flu and Zyrtec. View detailed information regarding this drug interaction. See details › 2. Is It Safe to Take Cold and Allergy Medication Together? - POPSUGAR5 jun 2024 · Technically, yes. But because symptoms are similar for colds and allergies, you don't necessarily have to double down on the medications. Also, ...Many over-the-counter medicines may have similar active ingredients. So, can you take allergy medicine with cold medicine together without risk? See details › 3. Antihistamine/Decongestant Combination (Oral Route) Side EffectsAlthough certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur.Drug...
