(ar-moh-DA-fih-nil)

A drug that is used to treat certain sleep disorders, such as narcolepsy. It makes patients feel more alert and awake. It is also being studied in the treatment of insomnia and fatigue in patients treated for cancer. Armodafinil acts in a part of the brain that controls sleep and wakefulness. It is a type of wakefulness-promoting agent. Also called Nuvigil.