Today, I took 600 mg of phenibut just to see what kind of effects it would have. It's been about 2 hours since I took it and I'm feeling quite restless and almost stimulated. Cognition is relatively the same as it was baseline. I feel no real mood improvement.
Motivation has improved slightly but it's hard to focus on a single task because of restlessness. The restlessness is mainly mental.
I'll reply to this post in a few hours just to keep a log of the effects.