Personal Experience 

Since there isn't much to this article (or stub), I thought I would add some of my own personal experience with phenibut. I use it occasionally for insomnia. In my opinion, it is not a long term solution for insomnia. Tolerance develops for me within three days of consecutive use. I have never had a problem with withdrawal, but I have heard that is possible, but not life threatening, just uncomfortable.

Phenibut does has a long half-life so usage should be spaced out. I would recommend a maximum of one day usage according to label instructions, then a minimum of two days off. One use a week would be preferable.

It does work well for insomnia, and tends to produce vivid dreams, which is interesting, but its usage should be carefully monitored.

When used as directed, I have heard of no major side effects. It will increase the potency of sedatives, so that must be kept in mind.

This is just my own personal experience, hopefully more people will add to the discussion.