Compliance and persistence with bisphosphonate dosing regimens among women with postmenopausal osteoporosis

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Abstract
Objective: Poor compliance and persistence with bisphosphonates is a concern in postmenopausal osteoporosis due to its negative impact on fracture risk and healthcare costs as well as quality of life. Reducing oral bisphosphonate dosing frequency is one measure available to increase therapy convenience and practicality, with the hope of improving compliance and persistence. This study compared compliance and persistence with weekly and daily bisphosphonate regimens for postmenopausal osteoporosis.Methods: Administrative claims data (1997–2002) from 30 health plans were used to identify postmenopausal women (> 45 years) with osteoporosis, who had been newly prescribed a once-weekly (QW alendronate 35 mg or 70 mg) or once-daily (QD alendronate 5 mg or 10 mg or risedronate 5 mg) bisphosphonate. QW and QD cohorts were followed for 12 months from initial prescription. Medication possession ratios (MPRs) measured refill compliance during follow-up. Persistence was calculated as the number of days from t...