Which Nyquil?: different preparations with different formulations, at any rate, most caplets/pills contain doxylamine, an antihistamine, which can paradoxically cause CNS stimulation rather than sedation, also can cause blurred vision. It may take up to a day or two to be cleared off your system, so don't drive, rest no more doses, see your doctor/urgent care if symptoms worsen, best wishes
Answered 11/22/2016
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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