I don’t know why they changed the ingredient for ZzzQuill. I assumed it was because they used to use it in NyQuil before they changed to the doxylamine which rendered it useless for me in helping me to sleep. Maybe others complained that now their NyQuil doesn’t work anymore like it stopped working for me and this was their response.
Also, NyQuil changed their tagline and it no longer says it helps stuffy heads.