Modalert 200mg for Treating Obstructive Sleep Apnea Description Modalert (Modafinil) is a stimulant medication, which enhances memory, wakefulness, and attentiveness. It is said that this medicine has euphoric effects that can be compared with effects imparted by amphetamine or cocaine. In fact, Modalert also has an off-label use in boosting concentration, focus, and memory. The medicine is also used for the treatment of sleepiness caused due to narcolepsy or other sleeping issues. The medicine may be prescribed by your doctor for other uses as found safe and suitable.