Adderall and Ritalin are among the most commonly abused prescription drugs, especially among students. Remember that you were prescribed this medicine for a reason, and that giving it or selling it to others is unethical and may put their health at serious risk. If you think that the dosage isn't strong enough, discuss this with your doctor over the phone or in person rather than taking more than directed.

TL;DR in Chinese:
从最小剂量开始用药。 （用药时）不要声张 。 不要超量服药。