I've been using it for a few years with some breaks when I couldn't afford it. I use 200mg-300mg once daily and it does help with social anxiety and relaxation, I usually take it about an hour before leaving the house in the morning. I haven't had any problems with the low daily dose and have never experience withdrawal symptoms when I've suddenly stopped. It shouldn't be used with calcium channel blockers, baclofen, or anything else that interacts with gaba receptors for that matter.
I would discuss it with your doctor if you take any meds for nerve pain, convulsions, seizures, depression , etc. If they aren't familiar with it tell them baclofen is a phenibut analog and it would have similar interactions. I have never taken large doses, over 300mg, but have found that it takes effect much more quickly if added to a bottle of a sports drink like gatorade. If you take the powder or crystalline form of phenibut hcl I would suggest trying the f.a.a. (free amino acid) form, it costs more but doesn't have the acidic taste and for me it seems slightly more effective.
That's my two cents worth, your mileage may vary
Yeah, the limitation is where I live can't the F.A.A. form one, only found the Hcl, but for sure F.A.A. is more effective/pure/better-absorveability. I have read that cause less hungry feeling and appetite, too. Hcl is very very acid nasty taste. I said to my doctor I take phenibut as I started taking lamotrigine, I guess he doesn't aware what and how phenibut is and works. Maybe I will have to explain him.