Auryxia generics — when can they launch?
Auryxia (FERRIC CITRATE) · Keryx Biopharms · 2 active US patents · 1 expired
Where Auryxia sits in the generic timeline
Mid-term cliff: earliest active US patent for Auryxia expires in 2030 (~4 years). Generic developers typically begin ANDA bioequivalence studies 3-4 years ahead of this date. Paragraph IV filings + Hatch-Waxman 30-month stays may shift the effective entry by another 18-36 months.
Under US Hatch-Waxman, a generic enters via an ANDA (Abbreviated New Drug Application) and may file with one of four Paragraph IV certifications attacking the brand's listed patents. If the brand sues within 45 days, a 30-month FDA approval stay is triggered. First Para IV filer typically gets 180-day market exclusivity.
Patent estate by type — active patents
Method-of-use patents only carve out specific indications; generics can launch with a "skinny label" omitting those uses. Composition-of-matter patents block the molecule itself.
- Method of Use — 1 patent
- Formulation — 1 patent
FDA U-codes carved out by Auryxia patents
Method-of-use patents are listed against specific FDA Patent Use Codes ("U-codes") representing carved-out indications. Generics can launch with a label that omits these uses.
| U-code | Description |
|---|---|
U-2549 | (no description) |
Sample patent estate
Showing 2 of 2 active US patents. View full estate on the Auryxia drug page →
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This patent protects ferric citrate-containing tablets that meet certain dissolution, tableting, and disintegration standards.USPTO title: Ferric citrate dosage forms
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This patent protects ferric citrate-containing tablets that meet certain dissolution, tableting, and disintegration standards.USPTO title: Ferric citrate dosage forms
Sources
- FDA Orange Book — patents listed against Auryxia (NDA filed 2014)
- Auryxia drug profile — full patent estate, indications, clinical trials, pricing
- Keryx Biopharms patent portfolio
- Patent cliff 2030 — every drug losing US exclusivity that year
Patent term extensions (PTR, pediatric exclusivity), Hatch-Waxman 30-month stays, and FDA regulatory exclusivity (NCE/ODE/PED) may shift the effective generic entry date. Not legal advice.
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