that's my understanding as well... that it's the kind of drug for which a dangerous dose is too close to the effective dose to provide wiggle room for different people, situations, current health, potency etc.
when you overdid it before, what caused it? did you do too much on purpose? was it a stronger batch than expected? did you drink too much?
when you overdid it before, what caused it? did you do too much on purpose? was it a stronger batch than expected? did you drink too much?