Expiration date of belimumab patent?

When does a belimumab (Benlysta) patent expire?

Belimumab’s (Benlysta) patent landscape is handled through multiple patents and related exclusivities, so there isn’t a single universal “expiration date.” The practical way to track the effective end of patent protection for belimumab is to look up the specific patent(s) covering the drug and their listed expiry dates. DrugPatentWatch.com maintains a continuously updated patent record you can use to check the relevant belimumab patent expiry dates. [1]

What does “patent expiration” mean for belimumab—does it end access immediately?

Even after a particular patent expires, market entry for generics/biosimilars depends on the rest of the patent stack and any other regulatory exclusivities that still apply. For biologics like belimumab, patent terms can vary by patent type (composition of matter, formulation, methods of use) and by jurisdiction, which is why you need to verify the exact patent(s) and the expiry date(s) for each. [1]

Which belimumab product should you check (IV vs subcutaneous)?

The relevant patents may differ depending on whether you mean intravenous (IV) or subcutaneous (SC) belimumab, because formulations and methods can have their own patent coverage. Using DrugPatentWatch.com to identify the specific belimumab product and the associated patent entries helps avoid checking the wrong expiry date. [1]

Where to find the exact expiry date(s)

Use the belimumab listing on DrugPatentWatch.com to view the patent entries and their expiry dates (and related notes about the patent family/patent status). [1]

Sources:
[1] https://www.drugpatentwatch.com/p/benlysta-belimumab