Soviets/Russia came up with a whole bunch of abusive drugs to deal with cold and exhaustion (racetams, etc)
Sometimes I go read the WADA banned list just to see what people are messing with
(cathinones and derivatives already banned by WADA)
A lot of the stuff comes out of horse racing
Though I wonder if there is a risk of causing accidents. Feeling focused is not the same as being focused, especially if on drugs. The effect might be ok to get some slick sales presentation over or do some programming work, but that doesn't mean I'd like to be in a car driven by someone on that thing or in the proximity of their weapon.
The Nazis gave you speed as part of a standard kit. That's why the Blitzkrieg was done in one wave with no rotations.
The drawback is that those soldiers were all a health wreck after 4-5 years on that stuff.