I cannot quantify - I have too much of a hard time, but I can say that benzos were only (if at all, truly) euphoric when I had no or very little tolerance, and took a decent dose. Butalbital, the barbiturate, has always treated me very nicely - a mild euphoriant at 50 mg, a bit more at 100 mg (for me when I had no GABAergic tolerance), but sometimes the euphoria goes unappreciated for euphoria because it does present modestly in 50 mg doses. It is, though, a drug I am very fond of, and it has been truly euphoric for me, being a barbiturate. Alcohol has been very euphoric at times for me, esp. when I was fairly alcohol-naive, I could be lit and really be lit, if that makes any sense. Nitrous oxide, which supposedly has some GABAergic activity has also been quite euphoric for me, but the euphoria has to be the shortest-lived I have ever had after dosing, though nice. I began using most of these GABAergics all around the same time, and so a lot of combos were euphoric, and cannot always say whether a certain drug alone was or was not, and how much. Also hard because GABAergics do induce their notorious amnesia, so I can't always recall how nice it was. Now, I am on 4 mg clonazpeam daily, and 1 mg alprazolam daily. I've recently been dabbling (again) with butalbital (just 50 mg), and find I can still feel quite nice with that in combo with my benzos and other daily drugs, obviously not recommended to mix CNS depressants, esp. because barbiturate and alcohol tolerance rise while the inherent lethal dose only rises a bit with tolerance, and because of the VERY pontentiating and synergistic GABAergism, so to speak, when combining GABAergic drugs of different mechanisms (like benzos and barbs, for example). Just my words of sincere caution, since I brought up such dangerous combos, and they are dangerous and risky. Anyhow, that is what I have to write on the euphoria of GABAergics.