Propacetamol hydrochloride is a precursor drug of acetaminophen. After intravenous injection or intramuscular injection into human body, it can be quickly hydrolyzed by Plasma Esterase to produce free acetaminophen, which overcomes the instability of acetaminophen and plays pharmacological roles such as antipyretic and analgesic. The analgesic effect of propanthamol hydrochloride is similar to that of opioids, but it has no inhibitory effect on the central nervous system, so it will not cause adverse reactions such as respiratory depression, nausea and vomiting, and has the characteristics of non addiction and efficient analgesia; As a new non prescription drug, it has no clinical adverse effects on gastrointestinal pain and post-operative pain. It is not only a simple non prescription drug, but also a non steroidal drug. It has no clinical adverse effects on gastrointestinal pain and post-operative pain.