Hmmm
@BadBoy377 that is a good question. See, I haven't really gotten recreational effects from Gabapentinoids in some time. However, I remember enough to know this: if you take a solid dose of Pregabalin (300mg-450mg) then you can consume more caffeine, as it kind of smooths out the rough edges. I would always say the same thing about Opioids. I could consume more caffeine, so I did and it always felt like they went well together. All of the jitters and peripheral side effect of caffeine are smoothed out in my opinion.
If I remember correctly, I think 50mg Ephedrine is a good place to start. Someone with tolerance to similar stimulants i.e. caffeine can probably tolerate as much as as 100mg Ephedrine.