Phoslo generics — when can they launch?
Phoslo (CALCIUM ACETATE) · Fresenius Medcl Care · 3 active US patents · 0 expired
Where Phoslo sits in the generic timeline
Imminent generic cliff: earliest active US patent for Phoslo expires in 2027 (~1 year from today). ANDA filers are likely already preparing Paragraph IV certifications. Expect first-filer 180-day exclusivity competition imminently.
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 — 3 patents
FDA U-codes carved out by Phoslo 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-1469 | (no description) |
Sample patent estate
Showing 3 of 3 active US patents. View full estate on the Phoslo drug page →
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This patent protects a method for binding phosphorus in the gastrointestinal tract by administering an aqueous solution of calcium acetate.USPTO title: Liquid compositions of calcium acetate
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This patent protects a method for binding phosphorus in the gastrointestinal tract by administering an aqueous solution of calcium acetate.USPTO title: Liquid compositions of calcium acetate
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This patent protects an aqueous liquid composition of calcium acetate, sweetener, and taste masking agent for binding phosphorus in the gastrointestinal tract.USPTO title: Liquid compositions of calcium acetate
Sources
- FDA Orange Book — patents listed against Phoslo (NDA filed 1982)
- Phoslo drug profile — full patent estate, indications, clinical trials, pricing
- Fresenius Medcl Care patent portfolio
- Patent cliff 2027 — 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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