If you add 'medical' before reason, then it is wrong. For sure there was some reason but it was far away from medicine.
F.e. arguments for meldonium ban was like
“[It] demonstrates an increase in endurance performance of athletes, improved rehabilitation after exercise, protection against
stress, and enhanced activations of
central nervous system (CNS) functions.”
"excessive and inappropriate use in a generally heathy athlete population."
"A study conducted at the European Games in June 2015 and later published by the British Journal of Sports Medicine found 66 of 762 athletes taking meldonium"
So there is a drug, it's working, it is used - let's ban it, it is our job, isn't it? WADA knowledge of meldonium was so bad that they didn't even know proper it's pharmacokinetics and lifetime (so they later had to change their "norms"), but they still ban it. Not because they did some studies and show ppl health become worse BECAUSE of meldomium. Double blind experiments, statistical inference corrections? Cmon, what are these magical spells?
I do not know the reasons behind it but it was definitely not medical. I would say that it is a kind of automatic properties of any controlling entity - rules become stricter and stricter, they just produce it, it is their 'nature'.
In "normal" law we have standard trinity of parlament-enforcement-court, so those properties are kind of 'controlled'
But it doping world it is united in a single entity AND there is no Presumption of innocence.
So imagine your life in a country where normal laws are created, enforced and judged by the same entity, AND you have "to prove you are not a camel" as Russians say.