Primidone

Primidone on the U.S. market: products, makers and brands

How Primidone appears in the FDA’s National Drug Code Directory — including its dosage forms, strengths, brand names, manufacturers, and FDA-listed product records. These are directory records, not sales or prescription volume.

22 companies list 42 Primidone product records with the FDA, mostly as tablet; the earliest marketing or approval year on record is 1954. Brand names on the directory include Mysoline; the rest are generics.

Also listed with the FDA, not a patient dose form: Powder (7) — bulk drug substance sold to compounders/manufacturers and multi-item kits. These aren’t counted in the dose-form total above.

Share of FDA-listed product records by manufacturer — FDA National Drug Code Directory. Record counts are not sales or prescription volume.

How widely Primidone is used (Medicaid data)

A general measure of how commonly Primidone is prescribed, based on Medicaid — one of the largest public drug programs. The figure below is prescriptions filled in Q1–Q4 2025, summed across every form and brand of the drug.

Think of this as a proxy for how widely Primidone is used, drawn from freely available public data. Medicaid is just one program — these numbers don’t include Medicare, other government coverage, or commercial and cash-pay prescriptions, so real-world use is higher than what’s shown here.

How commonly is Primidone prescribed? Of the 1,601 medications we measure, Primidone ranks #509 by Medicaid prescriptions — more than 68% of them.

Source: Medicaid State Drug Utilization Data (CMS), aggregated by generic ingredient — summed across every NDC (all brands, strengths, salt forms and dosage forms) of Primidone, and across all states and both fee-for-service and managed-care claims. A general popularity signal; it excludes Medicare, commercial insurance and cash prescriptions, so it is not total U.S. use. Based on the 24 of 147 listed Primidone NDCs with Medicaid activity.

Compare Primidone products

A representative set of FDA-listed product records for Primidone — across manufacturers, strengths, and dosage forms, grouped by form with each product’s manufacturer and how the FDA approved it. The same medicine may be made and packaged by different companies, so a single drug can have many directory entries. (It’s also why a refill can look different — a new shape, color, or box — even though it contains the same medication.)

Showing 42 of 42 products — FDA National Drug Code Directory. See every product, package size and price: browse all 42 Primidone NDCs →

💵 What Primidone costs pharmacies (NADAC benchmark)

The national average invoice price pharmacies pay for the drug itself, from CMS's NADAC survey (data as of Sep 30, 2026). This is a supply-cost benchmark — not a retail price and not what you'd pay at the counter.

Source: CMS National Average Drug Acquisition Cost (NADAC), a survey of retail pharmacy invoice prices. Benchmarks shown are the range across package sizes of a representative product for each form and strength — other manufacturers' products may differ.

Primidone brand names

Primidone is sold under one brand name in the FDA directory — Mysoline. A brand and its generic contain the same active ingredient; the brand name belongs to one company's product.

Who makes Primidone: manufacturers and labelers

22 companies list Primidone products with the FDA. By number of product records, the largest are Advagen Pharma Limited, Aphena Pharma Solutions - Tennessee, LLC, American Health Packaging. Labelers include manufacturers and repackagers; the product in your bottle depends on which one your pharmacy stocks.

Medications related to Primidone