Modalert 200mg is a wakefulness promoting drug used in adults to treat excessive sleepiness due to certain sleep disorders such as narcolepsy, shift work sleep disorder or obstructive sleep apnea. It works to keep you awake when you don’t want a unwanted sleep. Modalert 200mg is a prescription medicine contains Modafinil as an active ingredient used to promote wakefulness in patients suffering with excessive daytime sleepiness caused by narcolepsy, sleep apnea or shift work. It works to reduce unwanted sleep during a schedule work time. Modafinil is composed with two different types of enantiomers: armodafinil (R)-modafinil and esmodafinil (S)-modafinil that makes this drug more effective to treat sleep disorders. Modalert 200mg is a drug that stimulates the central nervous system. Its main ingredient is modafinil, which is used to keep people with narcolepsy, shift work sleep disorder, or obstructive sleep apnea awake.