The active life of Modalert 200 (modafinil) typically lasts between 12 to 15 hours. After oral administration, it begins to take effect within 30 to 60 minutes and reaches peak levels in about 2 to 4 hours. This extended duration of action helps promote wakefulness throughout the day, making it effective for conditions like sleep apnea, narcolepsy, and shift work sleep disorder. Due to its long half-life, Buy Modalert 200 is usually taken early in the morning to avoid interfering with nighttime sleep. Its effects gradually taper off, but late dosing may lead to insomnia or difficulty falling asleep at night.