The best way to buy Methylphenidate online with legal delivery is through a licensed online pharmacy. These pharmacies will require a prescription from your doctor and will deliver Ritalin to your home or office in a secure, discreet package. Additionally, these pharmacies will verify the authenticity of your prescription and ensure that the medication is delivered safely and securely. Ritalin (methylphenidate) is a central nervous sys tem stimulant. It affects chemicals in the brain and nerves that contribute to hyperactivity and impulse control. Ritalin is used to treat attention deficit disorder (ADD), attention deficit hyperactivity disorder (ADHD), and narcolepsy..