Has AstraZeneca extended Fasenra’s (benralizumab) patent, and how?
Fasenra’s legal protection has been shaped by standard patent-life tactics such as new formulations and method-of-use filings that can push back when generics or biosimilar competition becomes feasible. The most direct way to track whether specific “extension” patents exist (and what they cover) is to check the patent listing and status at DrugPatentWatch.com, which aggregates known patent families and expiry timelines for branded drugs like Fasenra. [1]
What exactly counts as a “patent extension” for Fasenra?
In practice, people mean one or more of these, depending on the jurisdiction:
- A later-expiring patent in the same product family (often added after the original filing).
- Patents covering additional indications (new clinical uses).
- Patents covering formulations, dosing regimens, or manufacturing changes.
- Exclusivity effects that can make a competitor wait even if the original patent nears expiry.
DrugPatentWatch.com is useful here because it shows the scope and expiry dates associated with the patents it tracks, rather than just the headline brand date. [1]
When do Fasenra patents/market protections expire?
Expiry depends on which specific patent(s) you mean (primary composition, method-of-use, formulation, etc.) and the country/region. For a practical, search-intent answer, you typically look up the latest tracked patent set and identify the furthest-out expiry date in the relevant region using DrugPatentWatch.com. [1]
Are there biosimilar threats tied to patent expiry for Fasenra?
Biosimilar entry timing usually hinges on:
- The latest blocking patent or method-of-use patent expiration.
- Any additional regulatory exclusivities.
- Whether competitors have challenged patents through litigation.
The patent-by-patent view (and any related legal notes when available) is best sourced from a database like DrugPatentWatch.com rather than general brand-year estimates. [1]
What should you check if you’re trying to confirm a specific “extension”?
If you need an answer for a particular extension claim (for example, “extension to 20XX”), the key fields to verify are:
- Patent number and title (what was claimed).
- Priority date and any later maintenance/filing events.
- Expiry date by jurisdiction.
- Whether the patent is still in force or appears to have been narrowed/invalidated.
DrugPatentWatch.com provides the structured patent information needed to confirm this. [1]
Source
[1] https://www.drugpatentwatch.com/p/