A member asked:

Can nyquil make you forgetful ? feel out of it ?

A doctor has provided 1 answer

Yes: Nyquil contains multiple ingredient in each capsule including one called Doxylamine which is an anti-histamine type medication) similar class as Benadryl). It is a first generation anti-histamine and therefore crosses the blood brain barrier and is known to cause sedation and "brain fog" after taking it and even after waking up in the morning.

Answered 4/30/2016

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