Tell me - did you ever come across Doriden (glutethimide)? I believe mixed with Tylenol #4 it converts all the codeine into M and produces a H-like high. Sounds deadly. Often wonder who discovered it & the other cocktail - T's and Blues (pentazocine & tripelennamine IVed).
I used to get Doriden regularly. I liked it quite a bit since it gave a nice buzz with good legs, it lasted a while.
Unfortunately, we didn't know about the codeine potentiation at the time. Always wished I could have tried that.
Interestingly though, the housewife who sold us these told us that she had found that a Doriden plus a Darvon gave a better buzz. So that's how she sold them, a Doriden and a Darvon for a dollar. Trying the Doriden by itself proved her right. The two together was definitely better.
I always wondered if the Doriden potentiated the Darvon or vice versa.
My buds weren't as enamored of the Doriden as I was. The liked the buzz, but hated the dry mouth it caused. I figured that was not an issue if you had beer.

Many a drunken evening started with a Doriden and a Darvon. My policy was always to take whatever downer was on the menu, wait a bit, then start the drinking, no more downers. That's a good policy especially with something like a barb. I've seen many a person on booze and barbs lying in the bushes, face tilted downhill so the vomit goes away from it. I've seen it first person a few times.
That policy did go out the window once Prince Valium became readily available. Valium has a higher overdose level, especially combined with alcohol. I knew that at the time. Am still lucky I'm alive I suppose.
@JackARoe Butalbital ain't that bad, is it? Not as near good as a regular barb for sure, but not useless.