Are medicines like Ritalin and Aderall used for both ADD and ADHD. If not, what is the best medicine for ADHD?

Im not a doctor or anything and im not completely sure how the medicine works on either ADD or ADHD but i have ADD in which i take adderall and my younger brother has ADHD and i have given him a sample of my adderall and he said that it works for him so id say that that works but again im not a doctor or anything thats just like a personal experience thing.