Modalert 200mg is used to treat excessive daytime sleepiness caused by conditions such as narcolepsy, shift work sleep disorder, and obstructive sleep apnea. It contains Modafinil, which promotes wakefulness and improves cognitive function, alertness, and focus. Modalert is typically taken in the morning or before starting a shift to help individuals stay awake and alert throughout the day. Due to potential side effects, it should be used under medical supervision.