I wonder if anyone has ever experienced addiction and specifically gaba-ergic withdrawal syndrome from amanitas....Certainly a physiological possibility.
It's an interesting question how such withdrawals might manifest compared to other gabanergics. Muscimol binds to the same receptor area as GABA itself on GABAA, rather than "less direct" regulatory sites like benzos and barbituates, which could make a difference.
I used phenibut last night, so I skipped it today during my amanita muscaria experience (8g dried, reaching a ++), but I did try it with GHB (in the form of 1,4 BDO). GHB is both a GABAb and GHB receptor agonist, so it's not the greatest for properly modulating the proportion of GABAA and b activity, but I can say there was synergy. I can't really say much about how good it felt or didn't though because I ended up having to make dinner during the most intense part of it. In terms of linear subjective intensity, the 2.5mL of 1,4 BDO I took felt at least 40 percent stronger than is typical of that dose. The speed and intensity of the onset made me worry about becoming nauseated on top of the demands of my culinary duties, so for about half an hour the high was "neutral" at best, then I rapidly came down.
Yesterday I made muscaria "tea" out of 8g and barely got past threshold effects (simmered crushed flesh for 40 minutes), so I don't recommend that option if you're concerned about potency, though I was surprised to find I sort of liked the taste (esp. compared to eating dried). This batch is quite a bit less potent than the ones I had as a teenager. At one point during that 10g experience I got up off the couch, put a video in, sat down, then proceeded to walk back and forth five times, each time needing to ask my friend if I had put the video in yet. Nevertheless, even at the ++ I reached today I was highly forgetful, comparable to smoking cannabis when you're already out it. It was a mildly pleasant little buzz -- a very open and relaxed state. I don't think I'd add more than 3g to it chasing something properly euphoric, though, since I imagine the amnestic effects would quickly mount to diminishing returns. I think a moderate dose of a GABAb agonist or a light dose of a dissociative would be better for that while maintaining the spirit of the amanita experience.