For some people, modalert (modafinil) can lose its usefulness over time, especially if they use it for a long time. When the body gets used to a medication, it needs higher doses to get the same amount of wakefulness or cognitive enhancement. This is called tolerance. Compared to other medications, modafinil has a lower chance of tolerance. However, some users may notice that it loses... https://www.medzsquare.com/au/modalert-200