Oseltamivir patent expiration date?

There isn’t a single “oseltamivir patent expiration date.” Oseltamivir (Tamiflu) is protected by multiple patent families covering the chemical itself, its salts (like oseltamivir phosphate), methods of synthesis, formulations, and uses. Each patent family expires at a different date depending on the country and term adjustments.

Key points:
- Expiration dates vary by country/region.
- The core composition-of-matter patents in many major markets have expired or are expiring around the late 2000s to mid-2010s, but there can be later-expiring patents covering salts, formulations, or specific uses.
- Some jurisdictions may still have active patents or regulatory exclusivities (e.g., data exclusivity) that can affect market entry timing.
- Generics are available in many places once the main patent families have expired, but exact timing depends on jurisdiction and any ongoing patent litigation or licensing.

If you tell me the country or region you’re interested in (and whether you want the patent covering the molecule, the salt/formulation, or a use/patent family), I can give you a more precise current status or look up the specific expiration dates. I can also guide you to patent databases (USPTO, EPO, WIPO Patentscope, Google Patents) to verify the exact family and expiration.