Overdose - can gbl induce a real coma?

[sensual88]

as the question enquires.. swim experienced a scare when a friend accidently over dosed on gbl, roughly double the average dose, swim presumes.

swim knows gbl produces a mini coma, but this friend did not wake for a couple of hours, and when they eventually did there was heavy rapid breathing until they'd slip back into sleep again. after about 6 hours of sleeping it off and the eventual awakening to sip water, swims friend woke up with no recollection of it happening and felt fine.

swim has since been informed that gbl can not induce a real coma, and only a 'mini' coma, is this true?