Across 9 first-hand reports, people mentioned a side effect 5 times (about 56 per 100 reports). The most common: stomach issues, acid reflux, addiction. User reports show what people notice — they can't tell you whether Phenibut Hcl is safe for you.
“I wouldn't try Phenibut people do have trouble getting off of it.”
“1-1.5 gram was perfect, but it is way too acidic for my stomach”
Conclusion: The seriousness of presentations, combined with the assortments of medications used for both syndromes, reflects the potential dangers of phenibut use and the need for systematized treatment protocols.
Conclusion: There are discrepancies in the reported side effects of phenibut in clinical trials compared to those reported in cases of online-purchased phenibut dependence and intoxication. The current systematic review provides evidence that, at therapeutic doses, phenibut is safe and well tolerated with minor adverse effects, but questions regarding the quality of phenibut obtained online and the contribution of alcohol and other drug abuse to phenibut dependence and intoxication remain open.