Buy Provogil Online. Provigil (modafinil) is an oral prescription medication that reduces daytime sleepiness in people with narcolepsy, obstructive sleep apnea, and shift work sleep disorder. Provigil, a central nervous system (CNS) stimulant, is believed to work by increasing the availability of certain chemicals in the brain, most notably dopamine Provigil is available in tablet form. Provigil is classified as a Schedule IV controlled substance. This means it has a potential for abuse and dependence but is less likely to cause dependence than stimulants like Adderall (a Schedule II controlled substance).