Modalert 200 mg is a medication primarily used to treat sleep disorders such as narcolepsy, sleep apnea, and shift work sleep disorder. It contains the active ingredient modafinil, which works by promoting wakefulness and reducing excessive sleepiness. While Modalert 200 may have some off-label uses, it is not specifically indicated for the treatment of depression. It is important to consult with a healthcare professional to determine the most appropriate treatment for depression.