Modalert 200 to study, you should take it in the morning or early afternoon so that it doesn't keep you up at night. The usual amount for learning is 200 mg, and you shouldn't take more than that in a single day. Get enough sleep before taking Modalert 200, since it can't replace sleep. Many students find that the drug keeps them awake for 12 to 14 hours, which lets them study for longer amounts of time. Also, it's recommended to get rid of any distractions, find a quiet place to study, and start working or studying as soon as the medicine starts to work.