Mildronate, its market name, is a non-prescription drug, so maybe aspirin, cough syrup, tablets for indigestion, who knows? The problem is that WADA has never specified, to my knowledge, what properties of Mildronate confer a performance advantage in sports. So how would you know what an equivalent drug would be if you don't even know what the drug is supposed to do. The label says it protects your heart, so what heart protection drugs do you take? What is meant by "heart protection?"
Aspirin is used as a heart protection drug because it has properties that help to dissolve blood clots. So any drug that has anti-inflammatory properties should be banned, even though athletes constantly suffer from severe inflammation. Or at least that's my expert medical opinion. The drug was only developed very recently in Latvia, in 1970, and we all know that there have been no new developments in pharmaceuticals since 1970.