Acetaminophen is a phenolic organic compound, which is used for fever caused by common cold or influenza. It also relieved mild to moderate pain such as headache, joint pain, migraine, toothache, muscle pain, neuralgia, dysmenorrhea. Acetaminophen is an antipyretic and analgesic drug. It selectively inhibits the synthesis of prostaglandins in hypothalamic thermoregulatory center by inhibiting cyclooxygenase, leading to peripheral vasodilation and sweating. Its antipyretic effect is similar to that of aspirin; It can inhibit the synthesis and release of prostaglandins, improve the pain threshold and play an analgesic role. It belongs to peripheral analgesics. Its effect is weaker than aspirin, and it is only effective for mild and moderate pain. This product has no obvious anti-inflammatory effect.