You are taking Zyrtec 10mg once a day and Robitussin DM for sinus and congestion you have a terrible headach and have no Tylenol so you took a dose of Dayquil Sinus Will they interract?

Zyrtec (cetirizine) and DayQuil Sinus (which contains acetaminophen, dextromethorphan, and phenylephrine) generally do not have significant interactions when taken together. However, combining multiple medications for sinus and congestion may increase the risk of side effects, such as drowsiness or increased blood pressure. It's important to monitor how you feel and consult a healthcare professional if you have any concerns. If symptoms persist or worsen, seek medical advice.