Modafresh 200mg Modafinil is a medication that contains the active ingredient modafinil. It is commonly used to treat excessive daytime sleepiness associated with narcolepsy, obstructive sleep apnea, and shift work sleep disorder. Modafresh 200mg works by affecting certain neurotransmitters in the brain to promote wakefulness and alertness. It is important to follow the dosage instructions a healthcare professional provides to ensure the safe and effective use of this medication.