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  • Title: The effect of a copay increase on pharmaceutical utilization, expenditures, and treatment continuation.
    Author: Motheral BR, Henderson R.
    Journal: Am J Manag Care; 1999 Nov; 5(11):1383-94. PubMed ID: 10662412.
    Abstract:
    OBJECTIVE: No research has evaluated the impact of an increase to a copay that is reflective of today's healthcare market. This study examined the effect of an increase from a $10 to $15 copay for brand drugs on key pharmaceutical utilization measures, including participation rates, treatment continuation, and expenditures, in an adult population. STUDY DESIGN: A quasi-experimental, pre-post design with control group was used. PATIENTS AND METHODS: Two different employer plans implemented an increase from $10 to $15 for brand copays in January of 1997. The utilization and expenditures of these plans were compared with those of a control group with a constant brand copay of $10 for 6 months preceding and 6 months following the copay increase. RESULTS: When other predictor variables were controlled for, the copay increase was not associated with a statistically significant difference in overall utilization compared with the control group, although brand utilization was significantly lower in the copay group. Savings to the payer were substantial, and resulted primarily from cost-shifting, reduction in brand utilization, and an increase in the generic fill rate. The rates of continuation with chronic medications in the 6 months following the copay increase were not reduced in the copay group compared with the control group. CONCLUSION: A copay increase can provide substantial savings to a payer without being a major deterrent to overall utilization or resulting in discontinuation of chronic medications.
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