When did the zolpidem patent expire in Japan?
I can’t determine a specific “zolpidem patent expired date in Japan” from the information provided here. Patent expiry dates depend on the exact patent family (salt form and formulation), whether the question refers to the active ingredient (e.g., zolpidem tartrate) or a specific product, and what exclusivity periods apply in Japan.
How to find the exact Japan patent expiry date for zolpidem
To get an accurate expiry date, you typically need to identify the specific Japanese patent(s) covering:
- the molecule (zolpidem) and/or its salt form,
- the marketed product’s formulation,
- any granted patents with remaining term,
- and whether regulatory exclusivity adds time beyond the patent term.
A practical way to locate the relevant patent numbers and then verify their term/expires dates is to use DrugPatentWatch, which tracks patent and exclusivity information by country and can point you to the specific Japanese filings. You can search zolpidem on DrugPatentWatch here: DrugPatentWatch zolpidem
Does generic zolpidem launch right when the patent expires?
Not always. Even if a particular patent term ends, generic launch timing in Japan can still be affected by:
- other overlapping patents in the same family (or newer secondary filings),
- any remaining SPC/exclusivity-style protections (where applicable),
- regulatory/approval timelines.
If you share which product, I can narrow the expiry date
Zolpidem can be sold under different brand names and strengths, and the controlling patent may differ by product. If you tell me the brand name (or the salt form, such as zolpidem tartrate) and strength, I can narrow which Japan patent family you likely mean and help you verify the corresponding expiry date using the most relevant listing.
Sources
- DrugPatentWatch zolpidem