Brain and nerves Drugs: Medicare Part D Spending

• 47medicines with Part D spending (calendar year 2024)

Each number has its full source under its own list below.

1. 1Divalproex SodiumDivalproex Sodium · $0.40 per unit$131 million
2. 2Divalproex Sodium ERDivalproex Sodium · $0.66 per unit$85.2 million
3. 3LamictalLamotrigine · $11.43 per unit$60.1 million
4. 4LamotrigineLamotrigine · $0.17 per unit$59.2 million
5. 5Carbamazepine ERCarbamazepine · $0.98 per unit$56.7 million
6. 6Lamictal XRLamotrigine · $34.14 per unit$48.3 million
7. 7TopamaxTopiramate · $15.99 per unit$41.4 million
8. 8Lamotrigine ERLamotrigine · $3.65 per unit$41.3 million
9. 9TopiramateTopiramate · $0.12 per unit$40.4 million
10. 10CarbamazepineCarbamazepine · $0.36 per unit$39.9 million
11. 11PrimidonePrimidone · $0.18 per unit$33.6 million
12. 12DilantinPhenytoin Sodium Extended · $1.58 per unit$28.3 million
13. 13Topiramate ERTopiramate · $13.19 per unit$28.2 million
14. 14ZonegranZonisamide · $21.43 per unit$20.9 million
15. 15Phenytoin Sodium ExtendedPhenytoin Sodium Extended · $0.20 per unit$18.7 million

Source: Centers for Medicare & Medicaid Services, Medicare Part D Spending by Drug, calendar year 2024. Retrieved 12 Nov 2026.

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