The role of de-prescribing in polypharmacy and inappropriate medication use For the International Group for Reducing Inappropriate Medication Use and Polypharmacy The issues around inappropriate medication use and polypharmacy (IMUP) for individual patients are well known: associations with harmful physical and psychological effects, negative implications for mobility and social interactions as well as the opportunity costs of the sheer burden of treatment. The effect of this problem at the population level is massive. Nearly one-half of older adults take five or more medications, and as many as one in five of these prescriptions is potentially inappropriate. 1,2 Older adults prescribed more medications are more likely to be hospitalized for an adverse drug reaction. 3 Moreover, adverse drug events account for more morbidity and mortality than most chronic diseases, 4,5 with death rates higher than many common cancers. 6,7 The prescribing cascade often attached to inappropriate medication use and polypharmacy drives overdiagnosis and overtreatment, escalating the cost of drugs and hospitalizations.