Amoxicillin patent expiration date?

There isn’t a single “amoxicillin patent expiration date.” Patents cover different things (the core molecule, specific salt forms, and various formulations or combination products), and those patents expire at different times in different countries.

- The basic amoxicillin molecule patent (composition-of-matter) generally expired in the early 1990s in many markets, after which generics became available.
- Patents on salt forms (e.g., amoxicillin trihydrate) or on particular formulations have their own expiration dates.
- Combination products (notably amoxicillin/clavulanate, e.g., Augmentin) have their own patent set, with some expirations in the late 1990s to 2000s, and some regulatory exclusivities (e.g., pediatric exclusivity) can affect market entry timing.

If you tell me:
- the country/jurisdiction, and
- whether you mean the core molecule, a specific salt/formulation, or a specific product (like Augmentin),
I can give a more precise expiration date or point you to the exact patent numbers and databases to verify.