Modalert (modafinil) doses of 100 to 200 mg per day are usually enough to help people study or concentrate, but this depends on the person's tolerance and doctor's advice. If you are new to the medicine or just want a milder benefit, 100 mg may be enough. However, 200 mg is usually suggested for a longer-lasting increase in alertness and focus. It's usually taken early in the morning ... https://www.medzsquare.com/au/modalert-200