Modvigil 200 mg with modafinil is used to treat several conditions primarily related to excessive daytime sleepiness. These include:

Narcolepsy: A chronic sleep disorder characterized by overwhelming daytime sleepiness and sudden sleep attacks.

Obstructive Sleep Apnea (OSA): A condition in which breathing stops and starts repeatedly during sleep, causing excessive daytime sleepiness despite CPAP and other treatments.

Shift Work Sleep Disorder (SWSD): A condition that affects people who work irregular hours or night shifts, resulting in difficulty staying awake during work hours and poor quality daytime sleep.

Modvigil 200mg helps manage the excessive daytime sleepiness associated with these conditions by promoting alertness and improving cognitive function. It is usually used as part of a more comprehensive treatment plan that addresses the underlying causes of these symptoms.