Psychostimulants for Fatigue in Prostate Cancer

Fatigue is one of the most common symptoms of prostate cancer. Fatigue is a lack of energy that makes it harder to do the things you normally do every day. Some symptoms of fatigue are: * feeling tired and/or weak; * having less interest in activities; * having trouble concentrating; * feeling \"down\"; * feeling exhausted for no clear reason. There are not many drugs that are helpful in treating fatigue. However, one group of medications does seem to be useful. In this study, we, the investigators at Memorial Sloan-Kettering Cancer Center, will be using a psychostimulant called Ritalin. The aim of this study is to see if this drug is helpful in treating fatigue in prostate cancer. We are also studying the side effects of this medication.