Unknown; not sympathomimetic; might increase dopamine concentrations while in the brain by binding towards the dopamine transporter and inhibiting dopamine reuptake Ferraro et al (1996) in the very first of a series of papers about modafinil’s steps confirmed applying in vivo microdialysis in rats that modafinil decreases GABA in https://dantevzbgi.rimmablog.com/25888762/a-secret-weapon-for-modafinil