Read Blitzed: Drugs in Nazi Germany by Norman Ohler, which is a fascinating eye-opener (and if you needed one of those, the Fatherland was just the place for you) of a book. From the extremely common and initially legal use of morphine, cocaine, and methamphetamine (the latter usually marketed as Pervitin, especially to front line troops, but also available as chocolates for the worn out hausfrau) to the extraordinary concoctions delivered hourly to the Fuhrer by Theodor Morell, his personal quack, I think it’s fair to say that the Nazis couldn’t have functioned without massive and frequent drug use.
This was particularly true of Hitler, whom Ohler wryly notes was mostly technically a vegetarian but really wasn’t if you consider the quantities of animal organ extracts with which Morell injected him (as well as meth, heroin, cocaine, and oxycodone, among other things). This of course contributed greatly to Hitler’s increasingly erratic behaviour and mental and physical decline from 1941 onwards. I am strongly reminded of the likely need for regular stimulant and sedative medication (gradually less effective as time goes on, resulting in longer and longer refractory periods between public appearances and extremely noticeable erratic behaviour and decline) that at least one modern head of state is currently exhibiting. I think the modern drugs of choice are Adderall and alprazolam; we’ve come a long way, pharmacologically speaking, in the last 80 years.