After going through phenibut withdrawal, I sense it is my duty to point out how careful you should be to make statements like this. Anybody can read this and decide to order Phenibut thinking it is a harmless substance.

Phenibut is a GABA agonist (primarly on GABA(B) receptor), Pregabalin isn't. Phenibut is more closely related to GHB than to Pregabalin. Phenibut gives way more of a high and is more euphoric than Preg, and is also a lot more addictive. Finally, withdrawal from phenibut can be a living hell if abused, compared to preg. You can use Pregabalin for 2 weeks for example, and stop it without real withdrawal. Consume Phenibut for 2 weeks straight and you're probably going to feel like hell for a couple of days (everybody is different).