Modalert 200 and other forms of modafinil are not categorized as mood stabilizers. Mood stabilizers are commonly used to control severe mood fluctuations in order to treat illnesses such as bipolar disorder. Modafinil is a wakefulness-promoting medication used to treat shift work sleep disorder, narcolepsy, and sleep apnea. Although it is not intended to treat mood problems, some users report feeling happier, more motivated, and more focused. In some situations, it may potentially exacerbate anxiety, irritation, or agitation. Before using Modalert 200, people with mood problems should speak with their doctor to prevent any bad consequences on their mental health. Modalert 200 should only be used as directed.