Unlike conventional stimulants, no anxiety, agitation and insomnia; selectively stimulates brain's adrenergic receptors for norepinephrine (noradrenaline), a neurotransmitter linked to alertness, learning, and memory.
Accounts of use for depression, ADD/ADHD, fibromyalgia, chronic fatigue (off-label). Metabolic precursor to modafinil; takes 1 hr to kick in, hard on liver. Not "controlled" like modafinil/Provigil.