What are the side effects ritalin (methylphenidate) abuse and withdrawals?

Side Effects. Ritalin (methylphenidate) is a good drug, but it does have significant side effects. It can cause high heart rate, appetite suppression, and even psychological side effects (hallucinations, etc) in some patients. It does have addictive/abusive potential. So, it does a good job when used correctly, but you just have to keep in close follow up with your doctor. You can be quite sleepy if you abruptly stop ritalin (methylphenidate).