Synthetic codeine analog— in common robitussin and generics— has a similar effect, combined with heavy sugar (skittles) load and slamming it. Was Trayvon’s drank of choice— been around a long time over the counter, and still is— if one is crazy enough to drink that much.
Back when, recall that Paregoric anti-diarheal was over the counter and had a 4% tincture of opium in it (really low dose percentage) but they had to stop— because, you guessed it— junkies were buying the stuff (some distilling in grain alcohol) and injecting it. Loons. Up till then it was a marvelous product for children with the poops— worked right away and gave them relief, used sparingly. No more. the druggies did this.