Common combinations of medications used among oldest-old women: a population-based study over 15 years

Residential Medication Management Reviews and continuous polypharmacy among older Australian women

Background Polypharmacy is an important consideration for the provision of Residential Medication Management Reviews (RMMRs) among older women given their enhanced risk of medication-related problems and admission to residential aged care (RAC). Objectives To determine the prevalence of the use of RMMRs among older women in RAC, and the association between RMMRs and polypharmacy, medications, and costs. Setting Older Australian women aged 79-84 years in 2005 who had at least one Medicare Benefits Schedule and Pharmaceutical Benefits Scheme record, received a service in aged care, and consented to data linkage. Methods Generalised estimating equations were used to determine the association between polypharmacy and RMMRs, while adjusting for confounding variables. Main outcome measures Prevalence of the use of RMMRs among older women in RAC, association between RMMRs and polypharmacy, medications, and costs. Results Most participants did not have continuous polypharmacy and did not receive RMMRs from 2005 [451 (67.4%)] until 2017 [666 (66.6%)]. Participants with continuous polypharmacy were 17% more likely to receive a RMMR (risk ratio 1.17; 95% confidence interval 1.11, 1.25). Participants in their final year of life and residing in outer regional/remote/very remote Australia were less likely to receive RMMRs. Out-of-pocket medication costs increased over time, and alendronate and aspirin were common contributors to polypharmacy among participants who received RMMRs. Conclusion Polypharmacy was associated with receiving RMMRs and around two-thirds of women who are entitled to a RMMR never received one. There is potential to improve the use of medicines by increasing awareness of the service among eligible individuals, their carers and health care professionals.