Wish I'd known at the time what DXM was and knew which kind was safer... that was before I started researching drugs, I didn't know a thing about weed, either, I thought "dank" meant it was nasty, gross weed (I thought of the normal meaning for the word, which evokes musty and damp). I thought that the color of hair on the weed dictated the nature of its effects, and I thought good weed was brick weed that wasn't brown. Actually, my Coricidin bad experience was part of the reason I took to the Internet to start researching... it led me to Erowid and eventually Bluelight, so for that, I am thankful.
But yeah, among my school, "everyone knew" that the best Coricidin was the HBP (I think it's HBP, not HBr=hydrobromide, the DXM salt in there). It was well-known as the strongest (it was, but also way more dangerous in above therapeutic doses).