Adrafinil supplementation increases alertness and wakefulness. Adrafinil is a stimulant, but it does not cause hyperactivity. Instead, it fights sleepiness.
Taking adrafinil may also improve memory, but further research is needed to confirm this effect.
Adrafinil works vicariously through modafinil. Further research is needed to determine the exact mechanisms of modafinil, but preliminary evidence suggests histaminergic signaling may play a vital role.
Safety information on adrafinil is lacking because modafinil is often used instead, for treatment of narcolepsy and excessive daytime sleepiness. Long term supplementation of adrafinil is not advised, since adrafinil is metabolized into modafinil in the liver, and there is no available evidence regarding liver safety. Adrafinil and modafinil are banned by the World Anti-Doping Agency (WADA) as a nonspecific stimulant compound.