2022
Association Between Generic-to-Generic Levothyroxine Switching and Thyrotropin Levels Among US Adults
Brito JP, Deng Y, Ross JS, Choi NH, Graham DJ, Qiang Y, Rantou E, Wang Z, Zhao L, Shah ND, Lipska KJ. Association Between Generic-to-Generic Levothyroxine Switching and Thyrotropin Levels Among US Adults. JAMA Internal Medicine 2022, 182: 418-425. PMID: 35226058, PMCID: PMC8886450, DOI: 10.1001/jamainternmed.2022.0045.Peer-Reviewed Original ResearchConceptsComparative effectiveness research studyIndex dateProportion of patientsTSH levelsNormal TSH levelsMIU/LThyrotropin levelsLevothyroxine productsGeneric levothyroxineNational administrative claims databasePropensity-matched patient pairsBaseline TSH levelsMean TSH levelsThyroid replacement therapyAdministrative claims databaseCurrent guideline recommendationsSerum thyrotropin levelsOptumLabs Data WarehouseStandardized mean differenceLevothyroxine doseLevothyroxine prescriptionsPropensity matchingGuideline recommendationsClaims databaseReplacement therapyRates of, and factors associated with, switching among generic levothyroxine preparations in commercially insured American adults
Brito JP, Deng Y, Ross JS, Choi NH, Graham DJ, Qiang Y, Rantou E, Wang Z, Zhao L, Shah ND, Lipska KJ. Rates of, and factors associated with, switching among generic levothyroxine preparations in commercially insured American adults. Endocrine 2022, 76: 349-358. PMID: 35107758, PMCID: PMC9210352, DOI: 10.1007/s12020-022-02987-z.Peer-Reviewed Original ResearchConceptsL-thyroxineLarge administrative claims databaseMultivariate logistic regression analysisAdministrative claims databaseThyroid hormone valuesLogistic regression analysisNumber of pharmaciesSettingRetrospective studyPrescription fillsTreatment initiationGuideline recommendationsThyroid surgeryClaims databaseFill dateMean ageHormone valuesLevothyroxine preparationsMore pharmaciesPractice guidelinesAdditional studiesGeneric preparationsNational dataAmerican adultsPatientsRegression analysis
2021
Levothyroxine Use in the United States, 2008-2018
Brito JP, Ross JS, Kawkgi O, Maraka S, Deng Y, Shah ND, Lipska KJ. Levothyroxine Use in the United States, 2008-2018. JAMA Internal Medicine 2021, 181: 1402-1405. PMID: 34152370, PMCID: PMC8218227, DOI: 10.1001/jamainternmed.2021.2686.Peer-Reviewed Original ResearchCardiovascular outcomes and rates of fractures and falls among patients with brand-name versus generic L-thyroxine use
Brito JP, Ross JS, Deng Y, Sangaralingham L, Graham DJ, Qiang Y, Wang Z, Yao X, Zhao L, Smallridge RC, Bernet V, Shah ND, Lipska KJ. Cardiovascular outcomes and rates of fractures and falls among patients with brand-name versus generic L-thyroxine use. Endocrine 2021, 74: 592-602. PMID: 34089480, PMCID: PMC9210353, DOI: 10.1007/s12020-021-02779-x.Peer-Reviewed Original ResearchMeSH KeywordsAgedDrugs, GenericFemaleHumansLongitudinal StudiesRetrospective StudiesThyroid HormonesThyroxineConceptsCongestive heart failureRate of fracturesCardiovascular outcomesL-thyroxineRate of fallHeart failureHip fractureAtrial fibrillationMyocardial infarctionNational administrative claims databasePropensity-matched patientsAdministrative claims databaseRate of hospitalizationMIU/L.Main outcome measuresSignificant differencesDose subgroupsHospitalization ratesClaims databaseThyroid cancerInpatient settingBaseline thyroidHormone levelsOutcome measuresPatients
2020
Comparative Effectiveness of Generic vs Brand-Name Levothyroxine in Achieving Normal Thyrotropin Levels
Brito JP, Ross JS, Sangaralingham L, Dutcher SK, Graham DJ, Wang Z, Wu Y, Yao X, Smallridge RC, Bernet V, Shah ND, Lipska KJ. Comparative Effectiveness of Generic vs Brand-Name Levothyroxine in Achieving Normal Thyrotropin Levels. JAMA Network Open 2020, 3: e2017645. PMID: 32997127, PMCID: PMC7527873, DOI: 10.1001/jamanetworkopen.2020.17645.Peer-Reviewed Original ResearchConceptsNormal thyrotropin levelsPropensity score-matched patientsThyrotropin levelsLevothyroxine prescriptionsThyrotropin valuesProportion of patientsAdministrative claims databaseMonths of initiationMIU/LMild thyroid dysfunctionLongitudinal cohort studyMedicare Advantage enrolleesNormal thyrotropin valuesEligible patientsInitial therapyLevothyroxine formulationsCohort studyThyroid dysfunctionClaims databaseGeneric levothyroxineLevothyroxineMAIN OUTCOMENormal rangePatientsNormal vs