It's true, straight from the horses mouth.
Bethesda's PR exec Pete Hines states...
"We want to make sure folks understand that the Australian version of Fallout 3 is identical to both the UK and North American versions in every way, on every platform.
An issue was raised concerning references to real world, proscribed drugs in the game, and we subsequently removed those references and replaced them with fictional names. To avoid confusion among people in different territories, we decided to make those substitutions in all versions of the game, in all territories.
I didn't want people continuing to assume the version in Australia was some altered version when it's not. There are no references to real world drugs in any version of Fallout 3
So because Australia had to go and have a sad over drug usage in Fallout 3, which has been in the Fallout series before, not to mention Half Life's hazard suit that pumps you full of morphine while screaming it in your ear every time it does, along with Bioshock's jamming of a syringe in to ones arm, which is far more graphic than any of the others listed above, you ALL get to have friendly and fuzzy names for your drugs.
"The drugs depicted are fictional; drugs are depicted as stylised icons on a menu with the drug use itself not depicted. Whilst navigating a post-apocalyptic futuristic landscape, players can invoke the use of a variety of "chems" listed by fictious names which include "Buff", "Rad-X", "Psycho" and "Ultrajet"."
Can't wait to bunt some fucking BUFF
in to my god damn fucking