When you buy Adderall online, you get a prescription drug along with a prescription. However, you must know that Adderall is considered as a controlled substance, and it’s illegal to buy the drug without a prescription. Those people who take the drug to stay awake might become dependent on it. Hence, health experts choose to prescribe the lowest dose of the drug and increase the dose slowly over time, as needed. Long-term effects of Adderall has been associated with weight loss, tremors, and decreased levels of dopamine over time.