Authors
Tengizi Mtchedlidze, Jeetendra Sah, Giorgi Modebadze, Pradeep Javarayee
Published in
Expert review of pharmacoeconomics & outcomes research. Oct 29, 2026. Epub Oct 29, 2026.
Abstract
Despite growing use of generic antiseizure medications (ASMs), brand-name products account for substantial Medicaid reimbursement. We assessed long-term reimbursement trends, potential savings from generic substitution, and patterns following generic entry.
Medicaid State Drug Utilization Data (2008-2025) were linked to RxNorm formulations. Utilization was measured in defined daily doses (DDDs), and reimbursement adjusted to 2025Q4 dollars. Hypothetical pre-rebate savings were estimated using formulation-matched generic rates. Event-study, Laspeyres, and state-level analyses assessed post-entry patterns.
ASM utilization, reimbursement, brand-name utilization and reimbursement shares, potential savings from generic substitution, and post-entry variation.
Reimbursement for 23 ASMs between 2008-2025 totaled $28.0 billion, including $19.1 billion for brand-name medications. Utilization increased 81.0%, while brand-name utilization share fell from 59.7% to 5.8%. Brand-name ASMs represented 70.8% of reimbursement in 2025. Potential pre-rebate savings totaled $5.8 billion, with 75.2% concentrated in five ASMs. Following generic entry, adjusted brand-name utilization and reimbursement declined 83.7% and 85.8%, respectively, among observations retaining brand-name use. Adjusted state reimbursement shares ranged from 9.6% to 60.2%.
Despite widespread generic adoption, brand-name ASMs continued to account for substantial Medicaid reimbursement. These findings highlight opportunities to evaluate prescribing and reimbursement patterns where generic alternatives exist.
PMID:
42958752
Bibliographic data and abstract were imported from PubMed on 30 Oct 2026.
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