Abstract
Background
Osteoporosis is a common cause of disability and death in elderly men and women. Until 2007, Australian Government-subsidized use of oral bisphosphonates, raloxifene and calcitriol (1α,25-dihydroxycholecalciferol) was limited to secondary prevention (requiring x-ray evidence of previous low-trauma fracture). The cost to the Pharmaceutical Benefits Scheme was substantial (164 million Australian dollars in 2005/6).
Objective
To examine the dispensed prescriptions for oral bisphosphonates, raloxifene, calcitriol and two calcium products for the secondary prevention of osteoporosis (after previous low-trauma fracture) in the Australian population.
Methods
We analysed government data on prescriptions for oral bisphosphonates, raloxifene, calcitriol and two calcium products from 1995 to 2006, and by sex and age from 2002 to 2006. Prescription counts were converted to defined daily doses (DDD)/1000 population/day. This standardized drug utilization method used census population data, and adjusts for the effects of aging in the Australian population.
Results
Total bisphosphonate use increased 460% from 2.19 to 12.26 DDD/1000 population/day between June 2000 and June 2006. The proportion of total bisphosphonate use in June 2006 was 75.1% alendronate, 24.6% risedronate and 0.3% etidronate. Raloxifene use in June 2006 was 1.32 DDD/1000 population/day. The weekly forms of alendronate and risedronate, introduced in 2001 and 2003, respectively, were quickly adopted. Bisphosphonate use peaked at age 80–89 years in females and 85–94 years in males, with 3-fold higher use in females than in males.
Conclusions
Pharmaceutical intervention for osteoporosis in Australia is increasing with most use in the elderly, the population at greatest risk of fracture. However, fracture prevalence in this population is considerably higher than prescribing of effective anti-osteoporosis medications, representing a missed opportunity for the quality use of medicines.
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Acknowledgements
This study was funded from existing salaries. Samantha Hollingworth, Inong Gunanti and Lisa Nissen have no conflicts of interest that are directly relevant to the content of this study. Emma Duncan has received speaker fees from Sanofi-Aventis/Procter and Gamble, Merck Sharp & Dohme, Novartis and Servier; has acted as a consultant to Amgen and Merck Sharp & Dohme; and has received travel assistance from Merck Sharp & Dohme, Sanofi-Aventis, Aventis and Servier to attend meetings. The data in these graphs were produced by the DUSC, Pharmaceutical Benefits Branch, Pharmaceutical Benefits Division, Commonwealth Department of Health and Ageing. The authors are grateful to Dr Rob Ware for his statistical advice.
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Hollingworth, S.A., Gunanti, I., Nissen, L.M. et al. Secondary Prevention of Osteoporosis in Australia. Drugs Aging 27, 255–264 (2010). https://doi.org/10.2165/11318400-000000000-00000
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DOI: https://doi.org/10.2165/11318400-000000000-00000