As to safety concerns, main thing is don't take too much and don't combine with alcohol or opiates. Phenibut acts on GABA receptors and so can be addictive in the same way as benzos. Personally I only ever take it to preload for molly or psychedelics, and so that keeps me out of trouble. I view it more as a supplement to other things though it can be fun in its own right. But I don't want to build a tolerance and then have it not work when I need it the most. Besides, there are other more fun things similar to that anyway (like ghb)

As to safety concerns, main thing is don't take too much and don't combine with alcohol or opiates. Phenibut acts on GABA receptors and so can be addictive in the same way as benzos. Personally I only ever take it to preload for molly or psychedelics, and so that keeps me out of trouble. I view it more as a supplement to other things though it can be fun in its own right. But I don't want to build a tolerance and then have it not work when I need it the most. Besides, there are other more fun things similar to that anyway (like ghb)

About 1 gram. Which is a strong dose. Less sensitive people could probably take half that for beneficial effect.

More like 2-3 hours ahead, phenibut has a slow onset. But yes, that's the gist.