I recently tried the supplement Phenibut for the first time to help me get to sleep. It was quite sedating and it got me wondering if it might work as a vestibular suppressant similar to how benzodiazepines are used to help stop an attack. So I started doing a little bit of research and I came across some interesting things: Has anyone ever tried the supplement Phenibut during an attack? If it can stop a vertigo attack, it would be amazing, as its OTC in the US.