Purchase Provigil online in Alabama with multiple card payment options. Enjoy fast delivery and reliable service for managing excessive daytime sleepiness associated with narcolepsy and sleep disorders. Order today! Provigil is a brand name for the medication modafinil, which is used to treat excessive daytime sleepiness associated with narcolepsy, obstructive sleep apnea, and shift work sleep disorder. It is also sometimes used off-label to enhance cognitive function and improve focus and alertness in individuals without sleep disorders. Modafinil affects certain neurotransmitters in the brain, specifically dopamine, norepinephrine, and histamine.