The primary cause of the sharp rise in Modalert 200 mg Pills usage in recent times is off-label use. While many medications are taken off-label, it is noteworthy how much Modafinil has been used for such a short time. Those with sleep disorders who take modafinil can stay up and alert longer. It functions by energizing the brain and raising dopamine levels there. In 1998, the FDA approved the medication for use as a prescription medication for individuals with narcolepsy and other sleep disorders.