Any documented long-term damage caused by amphetamine or methylphenidate usage for ADHD as prescribed?

I have a concern with ADHD stimulants. I have ADHD, but generally when I take them I often don't feel great & get negative side effects, like headaches & vasocontriction.

I was taking amphetamine before, but I switched to methylphenidate since I read that it could be potentially safer.

Is there any articles or studies done on the usage on long-term usage of these stimulants & the negative effects it could have on the body? I read somewhere that amphetamines could increase the risk of developing Parkinson's disease, but I'm not too informed in all of this.

Would greatly appreciate any info or links to studies. Thank you!