Which of the following substances is not classified as a narcotic?

Acetaminophen is not classified as a narcotic because it operates differently in terms of its pain-relieving mechanisms and effects on the body. Narcotics, or opioids, work primarily on the central nervous system to relieve pain and can also produce euphoria and have a potential for addiction. Substances such as Percodan, Dilaudid, and Morphine are all classified as narcotics because they contain opioid ingredients that interact with opioid receptors in the brain, leading to pain relief and other effects associated with narcotics. In contrast, acetaminophen functions as an analgesic and antipyretic, helping to relieve pain and reduce fever but does not support the same types of effects linked with narcotic substances.