![]() Copay assistance use across race, ethnicity, and income ranged from 28.2% to 31.1% (RA medicines) and 27.2% to 36.7% (oral oncolytic medicines). RESULTS: The sample included 67,674 patients prescribed RA medications and 9,560 prescribed oral oncolytic medications. Interaction terms for copay assistance use by race, ethnicity, and income were tested. Logistic regression models measured odds of copay assistance use (copay/discount cards or free-trial voucher) and prescription abandonment (prescription not filled within 30 days of health plan approval). The first prescription for rheumatoid arthritis (RA) or oral oncolytic medicines from 2016 to 2020 was included. METHODS: This pooled, cross-sectional study assessed claims-level prescription data linked to a consumer database containing information on race, ethnicity, and household income for commercially insured patients. OBJECTIVE: To assess disparities in copay assistance use prescription abandonment across race, ethnicity, or income and association of copay use with prescription abandonment and whether it differs across race, ethnicity, or household income. Whether copay assistance is associated with changes in prescription abandonment across different patient groups is unknown. BACKGROUND: Disparities in prescription abandonment may exacerbate health inequities.
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