From what I understand, the psycho drug gives your character: +50% damage resistance +3 agility -3 intelligence And yet, when I take it, I become almost completely indestructible. I've only taken it once in Fallout 2, and once in Fallout 1, both at points where I was having particular difficulty with a fight. I can't remember the Fallout 1 details too much, but I know that just taking psycho enabled my character to kill a bunch of super mutants that were otherwise beyond his capabilities. In Fallout 2 (which I am still playing), my unarmed-only character encountered the guns outside the military base and they were shredding me. So I took 1 psycho, and was at that point about to walk up to each gun and kick it to death, sustaining innumerable volleys of machine gun fire. It's as if just taking psycho made my character unable to be damaged by any attacks. +50% damage resistance doesn't seem like it would account for this, because it would just reduce by 50% the damage that I would take, not eliminate it completely. Also it seemed like my criticals became much more frequent and devastating, although my base agility was 10 already so I expect the +3 agility wouldn't have any effect at all. So why are the effects of psycho so much stronger than what it seems like they should be?