"The LD50 for rodents has been established to be greater than 5000mg/kg. Rat IV LD50 was also determined to be greater than 300mg/kg.[31]
In terms of humans, there exists a case report of a man who ingested 8,400mg pregabalin and eventually fell into a coma but was managed with supportive care alone until he regained consciousness.[32] For comparison, the maximum recommended a therapeutic dose of pregabalin is 600mg/day.[33] Pfizer's official package insert for Lyrica states that the highest accidental ingestion of pregabalin during clinical trials was 8 g, with no significant consequences.[34]"
It can still be quite dangerous when combined with other sedatives, opioids, or alcohol, so please be careful out there.