Flmodafinil vs Modafinil, comparison between the two substances states that both are making a lot of impressions in the field of cognitive enhancement and wakefulness promotion. Both are popular eugeroic drugs and have the same mechanism, but have different pharmacology, effects, and legal status. In 1988, Modafinil was accepted by the FDA and became popular as a sleeping pill to treat disorders like narcolepsy, obstructive sleep and shift work problems