I am afraid I don't have much knowledge of the movement disorder issue other than having minor twitches and spasms myself. That said I had the speech and tongue issues as a side effect of both gabapentin and to a lesser degree pregabalin. Gabapentin had a far better side effect profile for me in all other ways though. I often felt fat-tongued and very self conscious about my speech. The docs said it was one of the most common side effects. xx