Yup, basically the movie plot of Awakenings. Also, a family member of mine, whom was not catatonic, tried it for post-stroke fatigue/pain/neuropathy/brain fog to get away from gabapentin&pregabalin.
Also GP if you check this - what are the downsides of gabapentin your relative was trying to get away from? I thought that was a fairly benign drug, even for long-term use.