The making of a gadol is not by medication anyway. Gedolim are self made, though countless yeshivos dream of taking credit for one of their talmidim achieving such distinction. Some of the commenters are perfectly accurate when noting that even Talmudic brilliance will not be the deciding factor in becoming a “gadol”. There are multiple other variables. Some ride on the laurels of their ancestors, in-laws, others on their having gotten into positions of leadership and popularity. Throughout our generations, Klal Yisroel had incredible geniuses in Torah learning who never achieved the public roles as “gedolim”, and (dare I say) others who achieved status without having the true credentials to qualify.
Will a child with learning difficulties ultimately fare better if allowed to overcome them through will, determination, and behavioral help, or will helping the child have successful years of schooling with the aid of medication prescribed and used responsibly do better? I don’t know, but it is certain that yeshivos and schools cannot answer that either. I vote to turn this over to the experts.