Don't know why no one mentions the crash after a few hours on phenibut. Took 2 grams, then coasted along a few hours while it built up in my system. Then for about 3 hours I was flying high, then there was a slow winding down accompanied by 1) feelings of spinning in my head 2) being extremely tired and needing to lie down 3) very subtle hallucinations that kind of popped into awareness and vanished.
I really needed to crash and was groggy for hours. (This was the afternoon mind you). I honestly think the 3 hours of feeling good were not worth the 6 hours of feeling out of it. Maybe it's just me. Phenibut is not the answer.

First time i took it it was a really nice mellow smooth ride that i really enjoyed.

My second experience two days later was somehwat milder (even tho i had taken a larger dose) and was followed by the serious yawns, a headache, and general lethargy. Even some mild depression.

Im gonna give it a while before going again.

I got the spins and got very sick off of it my second time taking it. I ended up throwing up a few times, and was completely out of it. cold sweats, shivvering and all that shit. I had taken some ephedra ealier that day, I think it is very sensitive as to any other things in your system. just be carefull when you take it, and try not to mix it with other stuff.