Performance enhancing drugs...for classical musicians

I worry that at some point I'm going to run out of things to talk about here.. but people never cease to amaze. Evidently classical musicians (1 in 4!) are taking beta blocks (hypertension medicine) to quell their stage fright. The question is though... is this ok while performance enhancing drugs for sports are not? and what about kids getting ritalin for studying? at what point is the line drawn. If you read this blog you know what I think.