Meldonium isn't doping. It's an antioxidant, like drinking a cup of coffee.
But really it's only prohibited because it's not licensed by Western corporations.
In Eastern Europe meldonium is an over-the-counter drug that's routinely prescribed for all sorts of maladies and is considered a very mild and inoffensive medicine, just a step above drinking green tea.
1: https://sciencebasedmedicine.org/antioxidants-and-exercise-m...