See the DrugPatentWatch profile for Fezolinetant
What patent(s) cover fezolinetant, and when do they expire?
I can’t determine fezolinetant’s specific patent numbers or exact expiration dates from the information provided here. Patent coverage and timing depend on the country/jurisdiction and the particular patents in the “family” (active ingredient, formulations, and any method-of-use claims), plus adjustments like patent term extensions or pediatric extensions.
Who holds the fezolinetant patents, and what company markets it?
The patent owner(s) and market authorization holder(s) can differ. To identify who owns the relevant patents for fezolinetant and which company is using them commercially, I would need either:
- the jurisdiction you care about (e.g., US, EP/UK, JP), and/or
- the product name and sponsor on the label.
Does patent protection block generic or biosimilar entry?
Most oral small molecules like fezolinetant face “small-molecule generic” challenges: generics can typically enter only after relevant patents (and any exclusivity periods) expire, unless a generic successfully carves out a non-infringing route or a court/litigation outcome allows entry earlier.
Whether barriers are about patents alone or patents plus regulatory exclusivity depends on the jurisdiction’s rules for market exclusivity versus patent expiry.
Are there exclusivity periods besides patents (FDA/EMA style), and how do they interact?
Even when patents expire at a specific date, regulators can grant separate marketing exclusivity periods (for example, for new active ingredients or particular data packages). These can delay generic entry even if some patents are no longer in force. The details are jurisdiction-specific.
Can you tell me if a patent challenge (ANDA/litigation) is happening for fezolinetant?
To answer whether there are public patent challenges for fezolinetant, I need at least the market/jurisdiction (for example, “US only”). Different systems (ANDA filings in the US, parallel procedures in Europe) show up in different public records.
What information do you need to look up the exact patent dates?
If you tell me:
1) country/jurisdiction (US, Europe, UK, etc.), and
2) whether you mean the drug active ingredient, a specific formulation, or the main method-of-use,
I can narrow the search to the most relevant patents and report the expected expiry timeline based on those records.
Quick clarifying questions
Which jurisdiction do you want the fezolinetant patent expiry for (US or EU/UK), and are you asking about the active ingredient (small-molecule) patents only or also formulation/method-of-use patents?