I was on Ritalin for at least 10 years. Because I turned 65 my psychiatrist told me I had to go off the drug. She indicated it was the insurance company that called the shots. I’m on Nuvigil now (it’s a synthetic) but I don’t think it does a thing. I keep taking it anyway in the hopes that it will work. Maybe I did get “used to” the Ritalin, but it kept me functioning in all aspects of my life. Now I fall asleep whenever I’m idle – whether it’s watching TV, reading or waiting in a Doctor’s office.