Acetaminophen (also called paracetamol) was first synthesized and described in the chemical literature in 1877–1878, in the late 19th century.

Quick Scoop

Here’s the timeline in a nutshell:

  • 1877–1878 – First synthesis/description
    Chemist Harmon Northrop Morse produced acetaminophen in the lab in the late 1870s, publishing its preparation from p‑nitrophenol around 1877–1878.
  • 1880s–1890s – Early medical interest
    The compound was known but largely overlooked as doctors focused instead on related drugs like acetanilide and phenacetin for fever and pain.
  • 1940s – “Rediscovery” as the active metabolite
    Researchers in the late 1940s showed that popular drugs acetanilide and phenacetin are metabolized in the body to acetaminophen, which is actually the main active pain‑ and fever‑reducing agent.
  • 1950s – Enters the market
    On the back of this research, acetaminophen was reintroduced as a safer alternative to older drugs and launched in branded form (like Tylenol) in the 1950s.

So in direct terms: acetaminophen was discovered (first synthesized and reported) in 1877–1878, but only became a widely used medicine after its rediscovery and marketing in the mid‑20th century.

Information gathered from public forums or data available on the internet and portrayed here.