I want to say we were estimating a min of 60 mL as more than enough, but I can't remember how we arrived at that number.
If I remember correctly, we figured out that technically one ounce --30ml-- would probably be lethal, and then doubled it for safety's sake, which was convenient because Amazon was offering it as a 2oz sale. But accidental GHB fatalities of something like 10ml had been reported, when used with alcohol.
Alcohol, as a potentiator, definitely seems to be a key componant.
coma and death observed in patients after rectal administration of 15 or 30g 1,4-butanediol (estimated at 200 or 400 mg/kg bw).
so rectal administration is apparently a thing..at least you dont need antimetics
not sure if it wont burn your rectum though...probably not a good idea
you dont need much though if you do it rectally
1.4b has a density of almost 1 so 1ml = 1g
so a 90kg man would need between...
90*200mg = 18.000mg = 18g = 18ml
90*400mg = 36.000mg = 36g = 36ml
I used Prochlorperazine which I ordered online (prescription questionnaire required but easy to do!)
I took one every 8 hours for 48 hours before I took the GBL. Felt absolutely no nausea and didn't vomit whilst in a coma.