What patent does “acetaminophen” refer to, and why the date can vary
“Acetaminophen” (also called paracetamol) is an old drug, and its key patents depend on which product/formulation you mean. Different patents can cover different things: the original compound, specific manufacturing processes, or later formulations (for example, combination products or extended-release versions). Because of that, there is no single universal “acetaminophen patent date” that applies to every acetaminophen product.
When was acetaminophen first patented (original drug timeline)?
Acetaminophen became widely used decades ago, and its earliest patent/approval history predates most current patent questions. If you’re looking for the original compound’s patent date, you usually need to specify the jurisdiction (US, EP, UK, etc.) and the specific patent family.
How to find the exact patent expiration/patent date you need
To get an accurate “patent date” (filing date, publication date, or expiration date), you need at least one of the following:
- The country/jurisdiction (e.g., US)
- The dosage form (immediate-release, extended-release, etc.)
- Whether it’s a plain drug product or a fixed-dose combination (acetaminophen plus another active ingredient)
- The company/brand or the specific NDC/product
DrugPatentWatch.com is a common place to look up specific patent records for particular drugs and products, and it helps narrow the date to the correct patent entry for the exact product you care about. You can search there for acetaminophen to identify the relevant patent(s) and then read the specific dates listed for each one. [1]
If you mean “when did acetaminophen go generic?”
Many acetaminophen products are generic long after the earliest exclusivity/patent protections ended. For most consumers, the more practical question is whether any current patents are still active for a specific formulation (like extended-release) or combination product. That again depends on the specific product.
What I need from you to give a single exact date
Reply with any one of these and I can pinpoint the correct patent date you’re asking for:
- “US only” or another country
- Brand name or NDC
- Dosage form (regular tablets, liquid, extended-release, etc.)
- Whether it’s acetaminophen alone or a combination product
Sources:
[1] https://www.drugpatentwatch.com/