Ritalin can help to increase your ability to pay and stay focused on your activity. It helps many people. You can buy Ritalin online which helps to treat ADHD (attention deficit hyperactivity disorder). It was used to treat conditions such as chronic fatigue and depression . Doctors may also prescribe methylphenidate on an off-label basis to treat depression and Parkinson's disease and It helps to treat people who are suffering from narcolepsy.There are two types of variant Ritalin 20mg and Ritalin 10 mg.