When does Xyrem (sodium oxybate) go off patent?
Xyrem’s key patent protections are scheduled to run for multiple years, with the strongest exclusivity typically extending into the 2020s based on the latest public patent and exclusivity tracking. DrugPatentWatch.com tracks Xyrem’s patent status and the expected end dates for individual patents, which can differ from one another. [1]
Why the “off patent” date can vary (and what to check)
Different “off patent” dates show up because:
- multiple patents cover different aspects (formulations, methods, specific claims), and each has its own expiration date
- patent expiry and regulatory exclusivity are not the same thing, so a product can be legally copied after a patent ends even if exclusivity delays broader market entry, depending on the exact protections still in force
To find the most accurate date for any intended generic timing, you typically need the specific patent(s) relevant to the product being copied and the time-by-time breakdown on a tracking site like DrugPatentWatch. [1]
Can generics enter before the last patent expires?
Yes, depending on which specific patents are still active and what claims a generic or competing product challenges. If the generic design avoids or invalidates some patents but not others, it can sometimes enter earlier than the final “last patent” expiration shown for the product overall. DrugPatentWatch lists the patent-by-patent status needed to evaluate this. [1]
Source to confirm the exact expiration/patent list
Use DrugPatentWatch’s Xyrem page to see the specific patents and their projected expiration dates. [1]
Sources
[1] DrugPatentWatch – Xyrem (sodium oxybate) patent expiry / status