While is was taking MPH I'd take 10mg three times a day (male, 76kg). The times I'd taken twice that amount would turn me into a face twisted gargoyle. 40mg would be unpleasant for sure.
I met a couple of doctors at a party once who would take 60mg recreationally each before going dancing. Seemed unreal.
I met a couple of doctors at a party once who would take 60mg recreationally each before going dancing. Seemed unreal.