Buy Modafinil Australia is most often prescribed for narcolepsy but is also used as an off-label drug to enhance cognitive functioning in the general population, particularly when people need to remain awake and alert for long periods. It is reported to increase performance on tests of memory, speed of response, and concentration in healthy individuals. However, there is less evidence of its effectiveness in people who are not sleep-deprived. Research has shown that modafinil increases the release of monoamines in the brain, including serotonin. This may contribute to its effects on mood and alertness. For example, one study showed that modafinil enhances the increase in extracellular serotonin induced by the antidepressant drugs fluoxetine and imipramine via the DAT (see Ferraro et al, 2000).