Buy Provigil 100 mg Online To Relief From Narcolepsy on Newlifemedix. Provigil, the brand name for modafinil, is a wakefulness-promoting drug used to treat excessive sleepiness. It is commonly prescribed for narcolepsy, obstructive sleep apnea, and shift work sleep disorder. As a central nervous system stimulant, it helps individuals stay awake and alert. Modafinil use is typically taken as a 100 mg or 200 mg tablet. Common side effects include headache, nausea, and nervousness. Provigil side effects can include severe skin rashes and mental health changes.