This article proposes a model for regulating use of cognition enhancement drugs for nontherapeutic purposes. Using the method of reflective equilibrium, the author starts from the considered judgment of many citizens that treatments are obligatory and permissible while enhancements are not, and with the application of general principles of justice explains why this is the case. The author further analyzes and refutes three reasons that some influential authors in the field of neuroethics might have for downplaying the importance of justice: (...) (1) Justice applies only to public funds and state action—not to individual choice or corporate actors. (2) “Performance enhancement” does imply questions of justice, while “performance maintenance” does not. (3) There is no sufficient difference between cognition-enhancement drugs and other technologies to warrant the importance of justice for the debate. The challenges are refuted by taking into account the difference between consumption and tool use, and the influence of socioeconomic pressure for widespread use that existing drugs could have on the basic structure of society and equal autonomy of citizens. The analysis of requirements of justice points to a conclusion that introducing economic disincentives for the use of cognition-enhancement drugs would be the most legitimate public policy. With the imposition of taxes, fees, and requirements of additional insurance, the use and indirect coercion to use would be less profitable and less widespread, while additional funds thus created could be allocated to meet basic medical needs and/or education. (shrink)