Modalert 200 is often used to treat narcolepsy, a neurological disease that causes excessive daily drowsiness. It works by activating the brain to increase wakefulness, allowing people to stay awake throughout the day. Modalert 200 is typically effective and well tolerated, with fewer adverse effects than previous stimulants such as amphetamines. However, it is not a cure for narcolepsy and must be used daily to control symptoms. Common adverse effects may include headaches, nausea, and anxiety. It is essential to take Modalert under medical supervision because it can interact with other drugs and may not be appropriate for everyone.