Halacha defines what constitutes being a shoiteh. I don’t see how medication would change that.
Next thing you know, some people might also want to change the definition of a koton. Nowadays some people might even tell you a 13 year old is still a koton, even though the Torah tells us he is an adult. Y’know, children take longer to grow up these days; in the olden days they used to work on the farm by 13; nowadays even a 20 year old can be a child!