PubMed · 2363393
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D G Goodman. 1990. Valued services: are they provided?. https://pubmed.ncbi.nlm.nih.gov/2363393/
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OBJECTIVE: To review recent studies comprehensively assessing the impact of incentive-based multitier formularies on pharmaceutical costs and utilization. DATA SOURCES: PubMed (2001-December 2003) was searched using the key terms formularies, cost-sharing, and drug costs. STUDY SELECTION AND DATA EXTRACTION: Studies addressing the impact of implementing multitiered incentive-based formularies as a central component of an outpatient drug benefit were selected. DATA SYNTHESIS: One study using pharmacy claims from 25 employers with data from 402 786 members modeled the range of anticipated plan/employer savings associated with single- to 3-tier shifts and found that, going from a single- to 3-tier benefit results in decreased plan/employer pharmaceutical costs from $650 to $494 (24% decrease) per member per year and decreased pharmaceutical utilization from 12.3 to 9.4 (23.6% decrease) prescriptions per member per year. Another study demonstrated that adding an additional tier decreased pharmaceutical utilization, with a dramatic increase in member contribution offsetting the plan's expected increase in expenditures. This shift in pharmaceutical expenditures appeared to have no effect on overall medical utilization over a 3-year follow-up. Finally, a study converting members from a single- to 3-tier incentive-based formulary, associated with two- to fourfold copayment increases, resulted in a 10% discontinuation rate for angiotensin-converting enzyme inhibitors, statins, and proton-pump inhibitors among members who were primarily hourly employees. For salaried workers, the addition of a tier to their benefit appeared to have minimal impact on pharmaceutical utilization. CONCLUSIONS: Emerging data suggest a potential inverse relationship between pharmaceutical utilization and incentive-based formularies that increase member contribution to drug costs. Future research should focus on identifying price points and percentage increases at which members are likely to begin discontinuing necessary medications.
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