Buy Adderall online can be convenient, but it is crucial to use reputable pharmacies to avoid counterfeit products.This combination medication is used to treat attention deficit hyperactivity disorder - ADHD. It works by changing the amounts of certain natural substances in the brain.. It can help increase your ability to pay attention, stay focused on an activity, control behavior problems , organize your tasks and improve listening skills , treat a certain sleeping disorder (narcolepsy) to help you stay awake during the day. Loss of appetite, weight loss, dry mouth, stomach upset/pain, nausea/vomiting, dizziness, headache, diarrhea, fever, nervousness, and trouble sleeping may occur. If any of these effects last or get worse, tell your doctor promptly.