Prescription and nonprescription drug use among at-risk community-dwelling seniors in Ottawa-Carleton.
BACKGROUND: The Council on Aging Ottawa-Carleton conducted an evaluation study aimed at reducing the inappropriate use of medication by community-dwelling seniors. During a 17-month period from 1990 to 1992, 278 of 415 seniors consented to participate. All were new referrals to home care, all were 65 years of age or older and all were taking a minimum of six prescription medications. OBJECTIVE: To describe the patterns of prescription and nonprescription drug use among high risk elderly people living in the Ottawa-Carleton region. ANALYSIS: Descriptive statistics and logistic regression were used to explore relationships between the numbers of drugs (prescription and nonprescription), drug classes and drug subclasses, and sex, age and number of prescribing physicians. RESULTS: The top 10 prescription or nonprescription drugs taken by study participants were consistent among diseases and health problems most commonly found among the elderly. Comparisons by rank for subclasses of drugs indicated that eye, ear, nose and throat (EENT), and respiratory drugs were considerably more prevalent among males than females, while women took more hormones and anxiolytics, sedatives and hypnotics. Age also appeared to have an effect; the proportions of respiratory drugs and hormones decreased with age. In contrast, vitamins and EENT drugs were most prevalent among the oldest seniors. These findings were supported by the results of multivariate analyses. Having three or more prescribing doctors was positively associated with the use of laxatives. Findings from multivariate analyses indicated that for prescription drugs, the youngest age group was about four times more likely than the oldest age group to be taking at least eight drugs. For nonprescription drugs, the only statistically significant finding was that those with three or more doctors were twice as likely as those with one or two doctors to take at least one nonprescription drug.