everyone's tolerance to the drug can be different.
i've not tried etizolam but since i've heard it's like Lorazepam,
then i figure it would be a good drug to remove the anxiety.
you need take the dose you PERSONALLY need to get high,
plus a little bit extra (just to be on the safe side that no serious anxiety would arise )
or simply put,
take the amount you PERSONALLY need to get really high and that will definately be enough