Only at MayoMeds.com – Your reliable online pharmacy. > 24/7 Customer Support > Discreet Delivery > Free Shipping > Cash on Delivery > High-Quality Medicines > Secure Packaging > Same-Day Delivery Ritalin is commonly used to treat ADHD and narcolepsy. Ritalin is a medicine that helps people with ADHD focus better and pay attention for longer. It is a stimulant, which means it helps the brain work more actively and stay alert.