Adderal 20mg is a round yellow pill printed with AD on one side and 20 on the other and r it belongs to a class of stimulants. It is used for the treatment of ADHD (Attention Deficit Hyperactivity Disorder) and it can help to increase your ability to focus on every activity, pay attention to your work, control behavior problems, and help improve your listening skills. This medication is taken by mouth with or without food as directed by your doctor. Before taking this medicine, remember that you should not use this medicine if you have taken MAO inhibitor. The patients may face some common side effects of Adderall 20 mg like headache, dizziness, sleeping problems, weight loss, dry mouth, stomach pain, and changes in mood like feeling nervous, confused, and irritable and some patients may face some serious side effects like heart problem, circulation problems and serotonin syndromes. So, it would be better for you to follow your doctor’s instructions, and if you face any mentioned side-effect, consult with your doctor as soon as possible. After taking this medication, it starts working in 30 minutes to 1 hour and lasts up to 12 hours. If you forget to take any dose, never take a missed dose and the next dose at the same time.