Modalert 200 is a brand name for the drug Modafinil, which is used primarily to treat sleep disorders such as narcolepsy, shift work sleep disorder, and excessive daytime sleepiness associated with obstructive sleep apnea. Modafinil is known for its wakefulness-promoting properties and is sometimes used off-label to enhance cognitive function or combat fatigue. Modalert 200 is an effective medication for treating excessive sleepiness due to various sleep disorders. It's important to use it under the guidance of a healthcare provider to ensure safety and effectiveness.