Towards Responsible Use of Cognitive-Enhancing Drugs by the Healthy
Total Page:16
File Type:pdf, Size:1020Kb
University of Pennsylvania ScholarlyCommons Neuroethics Publications Center for Neuroscience & Society 12-7-2008 Towards responsible use of cognitive-enhancing drugs by the healthy Henry Greely University of Stanford, [email protected] Philip Campbell Nature.com, [email protected] Barbara Sahakian University of Cambridge, [email protected] John Harris University of Manchester, [email protected] Ronald C. Kessler Harvard Medical School See next page for additional authors Follow this and additional works at: https://repository.upenn.edu/neuroethics_pubs Part of the Pharmacology Commons Recommended Citation Greely, H., Campbell, P., Sahakian, B., Harris, J., Kessler, R., Gazzaniga, M., & Farah, M. J. (2008). Towards responsible use of cognitive-enhancing drugs by the healthy. Retrieved from https://repository.upenn.edu/ neuroethics_pubs/42 Reprinted from Nature, December 2008. Publisher URL: http://dx.doi.org/10.1038/456702a This paper is posted at ScholarlyCommons. https://repository.upenn.edu/neuroethics_pubs/42 For more information, please contact [email protected]. Towards responsible use of cognitive-enhancing drugs by the healthy Abstract In this article, we propose actions that will help society accept the benefits of enhancement, given appropriate research and evolved regulation. Prescription drugs are regulated as such not for their enhancing properties but primarily for considerations of safety and potential abuse. Still, cognitive enhancement has much to offer individuals and society, and a proper societal response will involve making enhancements available while managing their risks. Keywords cognitive neuroscience, enhancement, neuroethics Disciplines Pharmacology Comments Reprinted from Nature, December 2008. Publisher URL: http://dx.doi.org/10.1038/456702a Author(s) Henry Greely, Philip Campbell, Barbara Sahakian, John Harris, Ronald C. Kessler, Michael Gazzaniga, and Martha J. Farah This journal article is available at ScholarlyCommons: https://repository.upenn.edu/neuroethics_pubs/42 Advance Online Publication|doi:10.1038/456702a|Published online 7 December 2008 COMMENTARY Towards responsible use of cognitive- enhancing drugs by the healthy Society must respond to the growing demand for cognitive enhancement. That response must start by rejecting the idea that ‘enhancement’ is a dirty word, argue Henry Greely and colleagues. oday, on university campuses around the world, students are striking deals to Tbuy and sell prescription drugs such as Adderall and Ritalin — not to get high, but to get higher grades, to provide an edge over their C. GALLAGHER/SPL fellow students or to increase in some meas- urable way their capacity for learning. These transactions are crimes in the United States, punishable by prison. Many people see such penalties as appro- priate, and consider the use of such drugs to be cheating, unnatural or dangerous. Yet one survey1 estimated that almost 7% of students in US universities have used prescription stimu- lants in this way, and that on some campuses, Adderall is one of several drugs up to 25% of students had used them in the increasingly used to enhance past year. These students are early adopters of cognitive function. a trend that is likely to grow, and indications suggest that they’re not alone2. In this article, we propose actions that will campus to divert to enhancement use. be proven safe and effective, but if one is it will help society accept the benefits of enhance- A newer drug, modafinil (Provigil), has also surely be sought by healthy middle-aged and ment, given appropriate research and evolved shown enhancement potential. Modafinil is elderly people contending with normal age- regulation. Prescription drugs are regulated as approved for the treatment of fatigue caused by related memory decline, as well as by people such not for their enhancing properties but pri- narcolepsy, sleep apnoea and shift-work sleep of all ages preparing for academic or licensure marily for considerations of safety and potential disorder. It is currently prescribed off label for a examinations. abuse. Still, cognitive enhancement has much wide range of neuropsychiatric and other medi- to offer individuals and society, and a proper cal conditions involving fatigue5 as well as for Favouring innovation societal response will involve making enhance- healthy people who need to stay alert and awake Human ingenuity has given us means of enhanc- ments available while managing their risks. when sleep deprived, such as physicians on night ing our brains through inventions such as writ- call6. In addition, laboratory studies have shown ten language, printing and the Internet. Most Paths to enhancement that modafinil enhances aspects of executive authors of this Commentary are teachers and Many of the medications used to treat psychi- function in rested healthy adults, particularly strive to enhance the minds of their students, atric and neurological conditions also improve inhibitory control7. Unlike Adderall and Rita- both by adding substantive information and by the performance of the healthy. The drugs most lin, however, modafinil prescriptions are not showing them new and better ways to process commonly used for cognitive enhancement at common, and the drug is consequently rare on that information. And we are all aware of the present are stimulants, namely Ritalin (methy- the college black market. But anecdotal evidence abilities to enhance our brains with adequate phenidate) and Adderall (mixed amphetamine and a readers’ survey both suggest that adults exercise, nutrition and sleep. The drugs just salts), and are prescribed mainly for the treat- sometimes obtain modafinil from their physi- reviewed, along with newer technologies such ment of attention deficit hyperactivity disorder cians or online for enhancement purposes2. as brain stimulation and prosthetic brain chips, (ADHD). Because of their effects on the cat- A modest degree of memory enhancement should be viewed in the same general category echolamine system, these drugs increase exec- is possible with the ADHD medications just as education, good health habits, and informa- utive functions in patients and most healthy mentioned as well as with medications devel- tion technology — ways that our uniquely inno- normal people, improving their abilities to oped for the treatment of Alzheimer’s disease vative species tries to improve itself. focus their attention, manipulate information such as Aricept (donepezil), which raise levels Of course, no two enhancements are equiva- in working memory and flexibly control their of acetylcholine in the brain8. Several other lent in every way, and some of the differences responses3. These drugs are widely used thera- compounds with different pharmacological have moral relevance. For example, the ben- peutically. With rates of ADHD in the range of actions are in early clinical trials, having shown efits of education require some effort at self- 4–7% among US college students using DSM positive effects on memory in healthy research improvement whereas the benefits of sleep do criteria4, and stimulant medication the stand- subjects (see, for example, ref. 9). It is too early not. Enhancing by nutrition involves changing ard therapy, there are plenty of these drugs on to know whether any of these new drugs will what we ingest and is therefore invasive in a way 702 NATURE|Advance Online Publication|doi:10.1038/456702a|Published online 7 December 2008 OPINION that reading is not. The opportunity to benefit presumption that mentally competent adults ceutical enhancement as well? And if we answer from Internet access is less equitably distributed should be able to engage in cognitive enhance- ‘no’ to this question, could coercion occur indi- than the opportunity to benefit from exercise. ment using drugs. rectly, by the need to compete with enhanced Cognitive-enhancing drugs require relatively classmates and colleagues? little effort, are invasive and for the time being Substantive concerns and policy goals Questions of coercion and autonomy are are not equitably distributed, but none of these All technologies have risks as well as benefits. particularly acute for military personnel and provides reasonable grounds for prohibition. Although we reject the arguments against for children. Soldiers in the United States Drugs may seem distinctive among enhance- enhancement just reviewed, we recognize at and elsewhere have long been offered stimu- ments in that they bring about their effects by least three substantive ethical concerns. lant medications including amphetamine altering brain function, but in reality so does any The first concern is safety. Cognitive enhance- and modafinil to enhance alertness, and in intervention that enhances cognition. Recent ments affect the most complex and important the United States are legally required to take research has identified beneficial neural changes human organ, and the risk of unintended side medications if ordered to for the sake of their engendered by exercise10, nutrition11 and sleep12, effects is therefore both high and consequen- military performance19. For similar reasons, as well as instruction13 and reading14. In short, tial. Although regulations governing medicinal namely the safety of the individual in question cognitive-enhancing drugs seem morally equiv- drugs ensure that they are safe and effective for and others who depend on that individual in alent to other, more familiar, enhancements. their therapeutic indications,