F-Phenibut is also known as 4-Fluorophenibut, Fluorophenibut, Fluorobut, Baflofen and CGP-11130. It is a central nervous system depressant and closely related structural analog of phenibut.
F-Phenibut possesses an effect profile similar to phenibut but with a faster onset, significantly increased potency, and shorter total duration. It has recently become available through online research chemical vendors. However, little is known about this substance, particularly its potential toxicity and addiction potential. 4F-Phenibut HCl
The substance can be classified as a gabapentinoid. This is a class which contains other substances such as gabapentin, pregabalin, baclofen, and GABOB. It is a derivative of the naturally occurring inhibitory neurotransmitter γ-aminobutyric acid (GABA), with an addition of a phenyl ring that allows it to cross the blood–brain barrier.