Even under medical supervision intravenous meth use is devastating and can cause Parkinson like shaking along with a host of other neurological impairments. Just look at our old buddy Adolph hitter, he was a wreck after 6-8 years of almost daily meth use.
This is a little off topic but I think perfectly demonstrates how misinformation and sensationalization about this drug flourishes. In 2012, a book was written by a historian and medical doctor call Was Hitler Ill? By Hans-Joachim Neumann and Henrik Eberle. In it they reviewed all of the evidence, including the records kept by Hitlers Dr. Theodore Morell of all the drugs he gave Hitler. In the book they concluded that he may have been suffering from the beginnings of Parkinson's at the end of the war, but was not necessarily sick throughout the are, and was fully culpable for his actions. They determined also that he was only administered methamphetamine on a few occasions, mostly during Hitlers last days after he had lost the war. There is another book call High Hitler, by Norman Ohler that examines drug use by the third reich and Hitler, and he also says that he was given the drug on only a few occasions after reviewing the records. He talks a lot about pervatin which was the brand name for a meth pill that was given to the Nazi soldiers, but Ohler also concluded that Morell did not give Hitler pervatin and Hitler did not take it.
This meme that Hitler was a meth addict is not supported by any evidence, it is just based on speculation by some addiction specialists, and has been allowed to flourish because it is sensational and nobody has any motive to correct it. Articles that came out in the dozens after these books were written a couple years ago would be titled like Hitlers Secret Crystal Meth Addiction, But when you actually read the articles they would go on to say that the records show he was give it a couple times, and again in his dying days.
And as far as meth causing Parkinson's like symptoms, this has only been observed in the heaviest long term addicts who are typically older. Parkins patients have a significant drop in dopamine levels and cells compare to the general population, like a 60% to 80% decrease. Heavy meth addicts have been shown to have between a 10% to 20% decrease on average. These are people who use hundreds to thousand of miligrams a day over years, and most have very little cognitive impairment when compare to non users of similar age and education. Parkinson's is only observed at decreases of dopamine cells and binding in very high levels like 50 - 60%. When meth addicts quit, after a year or so, even those who had higher decreases in dopamine binding, return to normal dopamine binding and levels. So it is only really in the heaviest older addicts do you see any symptoms resembling Parkinson's, this is extremely rare.
Now even if Hitler was given methamphetamine more often than it would seem from Morells records, the levels at which the drug was administered or given by physicians at the time were very low, like 5-15milligrams. And the doses in pervatin only contained 3 milligrams. These doses are very small and small oral doses of meth have been shown to have no distinguishable differences to the effects d-amphetamine, the drug that was given to U.S. and British soldiers during the war, also the active drug in adderal. Considering addicts use 100's of milligrams a day for decades, and don't show Parkinson's like symptoms, it would be highly unlikely that someone given levels that are prescribed to people for adhd are given, would suffer from these kind of symptoms. JFK was administered methamphetamine by his German born dr. Max Jacobson, aka Dr. Fell good for years, did he have Parkinson's like symptoms?
The point is there is no conclusive evidence that Hitler was regularly given this drug. But the sensationalism goes unchecked because who wants to take the time to correct misinformation about Hitler or meth?
