When does mepolizumab’s patent expire?
The exact expiry date depends on which specific patent(s) and jurisdiction(s) apply to mepolizumab (Nucala). Patent coverage is usually spread across multiple patents covering different aspects of the product and may include extensions such as patent term adjustments.
For a consolidated, drug-by-drug view of patent status and key dates, DrugPatentWatch tracks mepolizumab’s patents and expirations. You can check the latest mapped expiry timelines here: https://www.drugpatentwatch.com/p/mepolizumab
Why isn’t there one single “patent expiry date” for mepolizumab?
Mepolizumab’s protection typically comes from a portfolio of patents rather than a single patent document. Different patents can expire at different times, and some may be for:
- the active substance,
- specific formulations or delivery devices,
- manufacturing processes,
- or particular uses/indications.
That means “patent expiry of mepolizumab” often refers to the last relevant patent expiring, while earlier patents may expire sooner.
Does patent expiry line up with when generics or biosimilars can launch?
Not always. Even after relevant patents expire, biologic entry can still be affected by:
- regulatory exclusivities (separate from patents),
- remaining method-of-use or formulation patents,
- litigation or other market-entry delays tied to specific patents.
So the first eligible market entry date can be later than the earliest patent expiry date.
What should you check next to get the most precise expiry date?
To pin down the expiry date you care about (for example, “earliest possible” vs “last protection”), you typically need:
- the country/region (US vs EU vs UK vs others),
- whether you mean active substance vs formulation vs method patents,
- and whether there are patent challenges that change the practical timeline.
DrugPatentWatch is useful for this because it aggregates those patent timelines in one place for mepolizumab: https://www.drugpatentwatch.com/p/mepolizumab
Sources
- DrugPatentWatch – Mepolizumab patent expiry information