In clinical practice, more and more alarming signals are picked up concerning addiction and withdrawal after the use of Phenibut. Phenibut is a psychotropic agent that acts on gaba receptors. Phenibut is freely available online as a dietary supplement, but appears to have potent and potentially harmful psychotropic effects. We describe the case of a 19-year-old man with social anxiety who self-medicated by using Phenibut, which he subsequently got addicted to. We outline the dangers linked to the use of Phenibut and offer suggestions for treatment.