It's generally not recommended to take Zyrtec-D (an antihistamine and decongestant) within 6 hours of NyQuil, as both medications can cause drowsiness and may have overlapping ingredients that could increase side effects. Always consult with a healthcare professional or pharmacist for personalized advice, especially if you have underlying health conditions or are taking other medications. If you're unsure, it's best to wait longer or seek medical guidance.
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