Interventions designed to improve the quality and efficiency of medication use in managed care: a critical review of the literature - 2001-2007.

Roblin et al [ 47 ] showed that large (> $10 per 30-day supply) and moderate ($7–$10) increases in cost-sharing attenuated an increasing trend of oral hypoglycemic medication use by 18.5% and 9.2% respectively over a 6-month period, while small ($1–$6) increases in copayments had no impact. ii.

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