Adderall is a stimulant medication used to treat attention deficit hyperactivity disorder (ADHD). It belongs to the group of medications called central nervous system stimulants. Adderall is available over the counter in some countries, but it is most commonly prescribed as a prescription medication. Adderall can be purchased online with PayPal and many other online payment methods. When buying Adderall 20mg online, be sure to read the product label carefully to make sure that the dosage you are taking is correct for your individual needs. There are many different brands and types of Adderall on the market, so be sure to find one that meets your specific needs. If you experience any negative side effects while taking Adderall, be sure to talk to your doctor about them. Negative side effects can vary depending on the individual, so it is important to speak with your doctor about any issues you have before taking this medication.