The Tylenol one said that they basically smell musty. Then goes on about how this smell has been associated with some people having slight gastrointestinal problems (vomiting, nausea etc.)
I tried to look into the Benadryl but that lead me in a huge circle.
It is probably the same issue with all of them, and is hopefully associated with the process of making the pills because none of the liquid forms are recalled.
I have tons of liquids of Tylenol, Motrin and Benadryl around for my son.