DIVALPROEX SOD ER 500 MG TAB

What it is

DIVALPROEX SOD ER 500 MG TAB is how the CMS NADAC file names this product. The FDA NDC Directory lists it as divalproex sodium.

FDA gives its dosage form as “tablet, film coated, extended release” and “tablet, extended release” and its route as oral.

FDA lists 13 labelers (the companies named on the label) for its NDCs, among them Mylan Pharmaceuticals Inc., Major Pharmaceuticals and NorthStar Rx LLC.

FDA lists it under 2 Established Pharmacologic Classes: Anti-epileptic Agent and Mood Stabilizer.

The NADAC file of 2026-10-14 prices it under 32 NDCs (National Drug Codes); the FDA directory lists 27 of them.

NADAC classes it as a generic drug (rate-setting class G), and does not mark it as sold over the counter.

What pharmacies pay

Pharmacies pay $5.83 for 30 tablets (30 × $0.19434 per EA, rounded to the cent), by the CMS NADAC file of 2026-10-14; that price took effect on 2026-09-23. That is what pharmacies pay their suppliers, not what they charge you.

NADAC’s explanation code for it: 1, calculated from the most recently completed pharmacy survey.

What NADAC measures · Why 30 tablets · NADAC explanation codes

The 13 labelers

Other strengths, forms and brands

11 other products in the NADAC file share the FDA nonproprietary name divalproex sodium with DIVALPROEX SOD ER 500 MG TAB.

Part D is one average per brand and generic name, over every strength and form.

CMS NADAC · nadac-national-average-drug-acquisition-cost-20261014.csv · eff. 2026-09-23 · as of 2026-10-14 · retrieved 2026-10-17

Medicare Part D · DSD_PTD_RY26_P04_V10_DY24_BGM.csv · eff. 2024-01-01 to 2024-12-31 · as of 2026-06-25 · retrieved 2026-10-18

Compared with its class

The middle of its 32 NDCs’ NADAC prices is $0.19434 per EA filed.

Of the 85 other products in FDA’s Anti-epileptic Agent class priced per EA, 62 have a higher middle NADAC price and 23 a lower one. The one in the middle is PHENYTEK 200 MG CAPSULE, at $1.4026 per EA filed (eff. 2026-09-23).

Of the 72 other products in FDA’s Mood Stabilizer class priced per EA, 54 have a higher middle NADAC price and 18 a lower one. The one in the middle is LAMOTRIGINE ODT 50 MG TABLET, at $1.27096 per EA filed (eff. 2026-09-23).

Prices are compared per unit, whatever the strength or dose, and a class is not a list of substitutes.

CMS NADAC · nadac-national-average-drug-acquisition-cost-20261014.csv · eff. 2026-09-23 · as of 2026-10-14 · retrieved 2026-10-17

How the class comparison works

What Medicare paid

Medicare Part D paid $19.71 for 30 tablets, at an average of $0.65685 per EA in 2024 (2024-01-01 to 2024-12-31) for “Divalproex Sodium ER” and “Divalproex Sodium”, every strength and form sold under that name together (Medicare Part D Spending by Drug, file of 2026-06-25).

That average covers 1,619,238 Part D claims (fills, including refills) for 2024-01-01 to 2024-12-31, across every maker, strength and form under the name.

Medicare's price is not your price.

What Part D spending measures · Which Medicare figure OpenBill compares · How the spread is worked out

What to ask at the counter

None of these figures is your price: what you pay depends on your pharmacy, your insurance, coupons and discounts.

• What is your cash price for 30 tablets? Is it lower than what I would pay through my insurance?
• If you have Medicare Part D: what is my plan’s copay or coinsurance for it? The Part D average on this page is not what you pay.
• These are questions about price, not medical advice. Do not change or stop a medicine without talking to your prescriber or pharmacist.