Yeah except the ones that save your life when you desperately need it. Is it wise to pump your body full of amphetamines? Probably not, but are all chemical/pharmaceuticals evil? No. What of the drugs putting you to sleep for surgery or the vaccines that eradicated diseases? (Please please please tell me you don't actually believe in the vaccine fear mongering?)
Long story short, you're an adult, so am I. If you don't like methylphenidate, then don't take it. But Be careful how quickly you recommend your own medical treatment for others. You brain is no more than electricity and chemicals, don't weight your ontology greater than reality.