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Nyquil Cold and Flu is a combination medication containing acetaminophen, dextromethorphan, and doxylamine. Overdose side effects can include drowsiness, blurred vision, upset stomach, nervousness ...

The Kirkland brand of cold and flu capsules, sold nationwide at Costco stores, is packaged as follows: Compare to Vicks Dayquil & Nyquil Vapocool for severe Cold & Flu Congestion. The medicine is ...