Medication use is recognized as the least expensive, most cost-effective health care intervention. In older adults this is especially important, as they are the largest consumer of prescription medications. We describe the use of a linked data set including pharmaceutical, medical, and hospital claims to examine pharmaceutical use in the population of older adults and then give several examples of its application. Indicators to describe the population's overall use of medication and the appropriate use of specific medication have been developed. Indicators of appropriate use are characterized using the dispensation of benzodiazepines to older adults. We have found that a significant proportion of new users of benzodiazepines are still prescribed a long-acting version (over 10%), signifying potential inappropriate use. The data are also able to describe some significant outcomes from the use of pharmaceuticals such as death, fracture, and population-based clinical measures where available.

While there is growing evidence of the increasing use of medicines by the elderly, research undertaken to critically examine differences among types of medicine users in this population is limited. Using population data, we examine the influence of social, demographic, and health-related factors on likelihood of being a non-user, a user of non-prescribed medicines only, or a user of prescription medicines only. We find some evidence of the rational use of drugs (i.e., those who are in better health are more likely to be non-users or to use non-prescribed medicines than those who are in poor health) and of rational explanations for reported use (i.e., being female is associated with less likelihood of non-use or exclusive use of non-prescription medicines than being male). Further analysis of the medicine-use patterns and decisions of elderly men and of those of elderly persons who are widowed or separated/divorced is warranted.