Oh this nice little odd molecule ... if there only was a way to reverse tolerance (I guess there is one. Heck, you can literally reset opioid tolerance* - But it's yet to be synthed.

)
Heard of almost no other drug of which the doses and natural as well as acquired tolerance varyes so fucking heavily. I remember in the beginning of my drug journey, 250-300mg got me almost drunk, this is average. Yet others can't stay awake with this dosage. And currently, it's just very subtle but yesterday I was in very bad mood, slight opioid withdrawal and had a package with me, so took additional 600mg to the 300mg taken in morning, and - boy was this great. Unfortunately, or fortunately as I was in public, I didn't get any of the psychedelic effects - CEVs for example. But sooo relaxed stimulation, so utterly clear headed, the only comparison is very low dose dissociative but they are more, well, dissociated. The effects lasted from 9pm way into the next day, I slept so well unlike usually, dreamt complete stories (get this often, and from the initial wow it got quite disturbing but this night was still remarkable. I actually lived these dreams..) Today took another 600mg, got heavy euphoria again until I made the mistake of take some morphine (maybe 15mg, it's out of XR capsules where I chew the lil balls so guessed) as I didn't want enter withdrawal - instantly killed the euphoric stimulation and made me pretty sad.. don't combine pregab and opioids, I did in past and was to write pregab off because I didn't get the euphoria.
Med-high dose pregab substitutes for morphine in me, this is interesting. Need to check if I can switch. But I know that pregab shares a similar withdrawal with maybe additional seizure risk..
So, back to topic. My hunch is that pregab is very safe UNLESS you have underlying seizure disorder. I've read reports of up to 3g (with heavy tolerance). My experience is that with increasing dose, it shifts into a pro-seizure agent (glutamate release) but people who don't suffer from epilepsy don't rush into seizures. I got these muscle twitches too with increased dose and at some point it began to feel slightly dangerous. Depending on wakefulness state it triggers some sort of nodding too. Was playing around with my mobile and fell down countless times, picked up, continue, next again the mobile on ground.. this isn't exactly funny.
My highest acute dose was 900mg. Combined I will have reached 2g probably.
Pregab alone is pretty safe.
This paper gives some insight. Don't combine with downers, then you'll be mostly safe.