Journal
PHARMACOEPIDEMIOLOGY AND DRUG SAFETY
Volume 19, Issue 12, Pages 1233-1240Publisher
WILEY
DOI: 10.1002/pds.2048
Keywords
bisphosphonates; medication adherence; osteoporosis; osteoporotic fractures; patient compliance
Funding
- Novartis Pharmaceuticals Corporation, East Hanover, NJ
- National Institute of Arthritis and Musculoskeletal and Skin Diseases [K23AR053856]
- National Institute on Aging [K01AG031836]
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Purpose Reducing dosing demands of medications generally increases adherence, although this relationship has not been demonstrated with the once-monthly oral bisphosphonates (BP). The study aim is to test whether switching from once-weekly BPs to once-monthly BPs improves adherence and fracture risk. Methods This is an interrupted times-series analysis of new users of once-weekly BPs in a nationwide administrative health database from 2003 to 2007. Participants include 1835 individuals who switched to once-monthly BPs and two propensity-matched comparator groups: 1835 individuals who switched to a different once-weekly BP, and 1835 who did not switch. We measured changes in adequate adherence pre- and post-switch as monthly medication possession ratio >0.80, and calculated incidence rate ratios (IRR) of osteoporotic fractures. Results All study groups experienced major adherence failure in the first year of therapy: the proportion of adequate adherers was 42% among once-monthly switchers, 47% among once-weekly switchers, and 37% among nonswitchers. However, the once-monthly switch was associated with less adherence failure (4% fewer adherers per month pre-switch vs. 1% fewer adherers per month post-switch, p < 0.000). There was no statistically significant change in adherence rates for the other groups. We did not detect significantly reduced fracture risk with once-monthly switch: 1 year post-switch, the fracture incidence risk ratios for once-monthly switchers relative to once-weekly switchers were IRR 0.83, 95% CI: 0.50-1.36, and IRR 0.90, 95% CI: 0.54-1.49, relative to nonswitchers). Conclusions Reducing the dosing demands of oral bisphosphonates from once-weekly to once-monthly decreased adherence failure but had an uncertain impact on fracture risk. Copyright (C) 2010 John Wiley & Sons, Ltd.
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