Acetaminophen (also called paracetamol) was first synthesized in the late 19th century, around 1877–1878, but it did not become widely used as a medicine until the mid‑20th century.

Quick Scoop: When was acetaminophen “born”?

Here’s the short timeline so “when was acetaminophen” actually makes sense:

  • Around 1877–1878: Chemist Harmon Northrop Morse first makes acetaminophen (paracetamol) in the lab.
  • 1880s–1890s: Doctors experiment with related coal‑tar fever drugs (like acetanilide and phenacetin), while acetaminophen itself stays mostly in the background.
  • 1940s: Researchers “rediscover” acetaminophen while looking for safer pain and fever medicines.
  • Early 1950s: Acetaminophen is presented as a safe, effective alternative to aspirin at scientific meetings and begins to be marketed as a pain and fever reducer.
  • 1950s–1960s: Branded products like Tylenol popularize acetaminophen and it becomes one of the most widely used pain relievers worldwide.

So in casual terms, acetaminophen was invented (first made) in the late 1870s, but it didn’t really become the everyday go‑to painkiller in pharmacies until about 70 years later in the mid‑1900s.

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