Ross JS, et al. – In this cross-sectional longitudinal analysis of national data from a large administrative claims database from January 7007 to December 2016, researchers identified temporal patterns of generic and brand-name thyroid hormone drug use, including patient and prescriber characteristics related to brand-name use. Study participants included adults with insurance coverage through commercial, Medicare Advantage, and Medicare Part D health plans. For all three beneficiary populations, the use of brand-name products was less common among older adults and more common among women and those receiving endocrinological prescriptions, as well as among those of the white race and grater household income for the Medicare Advantage and the commercial beneficiary populations. Among three large national insurer beneficiary populations, brand-name thyroid hormone product use declined from 2007 to 2016. Although some patient characteristics were related to the use of brand-names, the prescriber specialty was the strongest predictor.