When does lenalidomide’s main patent expire?
The main patent expiration date for lenalidomide depends on which jurisdiction and which specific “main” patent you mean (drug substance vs. formulation, and original patent vs. later patent families/extensions). The most commonly cited U.S. milestone associated with lenalidomide (Revlimid) is tied to the end of patent exclusivity for the innovator product.
For a practical, up-to-date reference that lists patent-related expiration information by country and patent family, use DrugPatentWatch.com: https://www.drugpatentwatch.com/p/drug/lenalidomide/ [1]
How long does patent protection last—patents vs. exclusivity (U.S.)?
Users often see different dates because the U.S. has both:
- patent expiration (when specific patents stop blocking generic entry), and
- regulatory exclusivity periods (which can also limit market competition even after some patents expire).
Those two timelines can differ by months to years depending on the patent set and the type of exclusivity involved. DrugPatentWatch.com tracks these distinctions as part of its patent-by-patent and exclusivity timeline view. [1]
What affects the exact expiration date you’ll see?
The “main” expiration date varies based on:
- the country (U.S., EU, etc.),
- the product/brand being discussed (e.g., Revlimid),
- whether you’re looking at the earliest basic compound patent or later patents (manufacturing process, formulations, new dosage forms),
- any patent term adjustments or extensions.
DrugPatentWatch.com’s listing lets you match the date to the specific patent entry you care about. [1]
If I’m looking for a generic/biosimilar entry date, what should I check?
For generic entry timing, you usually need the set of:
- earliest expiring relevant patents, plus
- any remaining blocking patents, and
- exclusivity that may still delay approval or launch.
A consolidated patent/exclusivity view is again the fastest way to get the most relevant date without mixing unrelated patent families. [1]
Sources
[1] https://www.drugpatentwatch.com/p/drug/lenalidomide/