Patients, physicians, pharmacists, formulary managers, and policymakers play an important role in generic drug use. Understanding the factors influencing generic drug use can help guide future policy, education, and practice interventions to increase generic drug use.

Funding for this study was made possible, in part, by the U.S. Food and Drug Administration through grant U01FD005486. Hansen has provided expert testimony for Daiichi Sankyo. No other authors have declared a potential conflict of interest. Views expressed in written materials or publications and by speakers do not necessarily reflect the official policies of the U.S. Department of Health and Human Services, nor does any mention of trade names, commercial practices, or organization imply endorsement by the U.S. government. Study concept and design were contributed by Howard, Harris, Kiptanui, Hansen, and Qian. Frank, Mishuk, Howard, Harris, and Kiptanui collected the data, and data interpretation was performed by Mishuk and Hansen, along with Qian, Harris, and Kiptanui. The manuscript was written and revised primarily by Mishuk, along with Qian and Hansen.

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