It definitely gives nausea and dizziness in excessive doses, just like alcohol and benzos (I assume most GABAergics in excess will cause this). To me (my max single dose is 4g), it never gave a sense of euphoria, certainly nothing like opiates or even the buzz I could sometimes get (albeit rarely) from short acting benzos like Xanax. Stimulation and sedation would cancel each other out, which one dominated when you took it? I found it didn't noticeably cause either for me.
Much like Kratom, I find higher doses to be more sedating and lower doses to be more stimulating.
However, even on the same dose I've experienced both with them coming in waves, some stimulation at one point and some sedation at another, but that's more rare and USUALLY at a single dose I tend to get one effect and not the other.
At least on the lower doses SERIOUS sedation doesn't usually occur but the stimulation happens.
Both could happen at the higher doses though.
I also never take more than 4 grams because that is what it says on the tub.
I also never take it more than once every 6 days which is smart.
I've found that similar to Kratom, Phenibut has a learning curve.
At first I thought I could only possibly enjoy it by combining it with other substances like Kratom but now I can have a GREAT time on nothing other than Phenibut.
I also get SERIOUS euphoria from listening to music and find it enhances my listening experience.
The stimulation I get from it is unique and different from the stimulation I get from other stimulants I like like Dexedrine and Kratom but it would be hard to explain just how.
And unlike benzos which just help with my anxiety Phenibut gives me an actual high.
I take Klonopin but it doesn't get me high and neither do other benzos like Lorazapam though I've never tried Xanax which I hear is the one benzo EVERYONE gets high from.
Actually, the most similar drug to the Phenibut high I find is the one time I was injected Valium before a surgery and that is the only time that a proper benzo gave me a high.
Even though that high only lasted like 15 mins before I was put under so it's not much to compared to, but they felt very similar.
Also, there are two types of Phenibut: FAA and HCL.
I've tried both and it's hard to tell the difference.
Some people say that FAA is "cleaner" in terms of the feeling which might be true, not sure.
The biggest difference is how they taste and look in that HCL looks and tastes like salt while FAA looks and tastes like flour.