Modvigil 200mg tablets, containing modafinil, are taken orally to promote wakefulness. For narcolepsy and obstructive sleep apnea, take one tablet in the morning with or without food. For shift work sleep disorder, take one tablet about an hour before the start of your shift. Always follow your healthcare provider's instructions, avoid taking it late in the day to prevent insomnia, and do not exceed the prescribed dosage