Distribution of prescription drug exposures in the elderly: description and implications.
Using data from a comprehensive prescription drug benefit program in British Columbia, we studied the distribution of prescription drug expenditures and exposures in the community-dwelling elderly over a 1-year period. Overall, 84% of the population was exposed to at least one prescription drug. The 11% of individuals with the highest level of use accounted for 50% of total drug expenditures. Individuals 65 to 74 years of age were exposed to a median of 2.2 different drugs during the year compared to a median of 3.8 for those 75 years of age and over. Twenty-four percent of the 65- to 74-year-old population were exposed to six or more different drugs during a 1-year period compared to 37% of the 75 years and over population. Central nervous system and cardiovascular drugs were most commonly responsible for multiple drug exposures. Forty-eight percent of the individuals exposed to six or more different drugs received prescriptions from three or more different physicians. In British Columbia, 98% of the elderly receiving six or more different drugs received at least one prescription from a general practitioner or a family practitioner.
Anderson
G
G
Institute for Clinical Evaluative Sciences, Toronto, Ontario, Canada.
Kerluke
K
K
D000368:Aged; D001955:British Columbia; D011307:Drug Prescriptions / Q000191:economics / Q000706:statistics & numerical data*; D004363:Drug Utilization / Q000191:economics / Q000706:statistics & numerical data*; D006801:Humans; D008511:Medicine; D010818:Practice Patterns, Physicians'; D011306:Prescription Fees; D013038:Specialization