Diagram of the molecular structure of Acetaminophen
Brand name: Tylenol®
Brand name: Paracetamol®
IUPAC: N-(4-hydroxyphenyl)ethanamide
FDA approval: Yes

Acetaminophen is used for the treatment of mild pain and fever.


The exact mechanism of action of acetaminophen is not completely understood. It selectively inhibits cyclooxygenase 2 (COX-2). It is classified as a non-steroidal anti-inflammatory agent but has only limited anti-inflammatory properties.

The diagram below shows the 3D molecular structure of Acetaminophen.

Side effects:

Side effects of acetaminophen are rare. However, extreme doses of acetaminophen or prolonged use can cause liver damage.