I was going to say baclofen. Mixed with speed, it's pretty close to G. Very similar to both phenibut and G, but still not as good as G. I've been prescribed pregabalin for years, and used to take 600mg+ at once, with booze, just for fun. It used to make me wobbly and maybe slightly euphoric, but doses above 450mg felt bizarre and stimulating. Definitely not very recreational, in my eyes. It doesn't activate GABA receptors directly, it just makes more GABA available. There's no particularly pleasurable relaxation from it, in my opinion. It also makes people fat, unless you constantly diet. I take maybe one or two doses of 150mg a week, now, instead of several times a day. It's good for stopping hangovers, if you have one before bed (exercise caution, if you're mixing the two!).