It use to be, a least in the 70's and 80's, that you could buy procaine and quinine hydrochloride from a smoke shop, liquor store, supplement store, or a bodega.Procaine was/is sold as a vitamin, some times as an incense/deodorizer. Quinine hydrochloride was OTC for leg cramps and for cleaning aquariums. I don't think they make pure quinine for aquariums anymore, not even the insoluble sulfate.
Still, even when you could buy them OTC, I've read cases where there was some dudes' whole job getting wholesale cuts like quinine for heroin mills.
I wonder if the Chinese originally put quinine in to mimic papaverine in opium?They both lower blood pressure and relax muscles. Hmm, I bet papaverine would be a great cure for dope dick:D, in addition to a good potentiator, since it's used off label for erectile dysfunction.
Lactose, inositol, and mannitol have no effect, well mannitol does in much higher doses than even the most cut bullshit.