Fentanyl is a synthetic analgesic drug with narcotic properties, which belongs to the opioid analgesics and is a prescription drug. Fentanyl is a highly effective opioid analgesic, commonly used for endotracheal intubation, general anesthesia using artificial respiration, mainly used for intraoperative analgesia and postoperative pain relief. The use of fentanyl in gynecology or surgery not only relieves postoperative wound pain but also prevents postoperative delirium symptoms. It can also be used in combination with anesthesia drugs as an intraoperative anesthetic adjuvant. The analgesic effect of fentanyl is strong, with an onset of effect in about 1 minute, a peak in 4 minutes, and can be maintained for about 30 minutes. However, fentanyl is metabolized quickly, and its effect will be reduced after metabolism. Moreover, fentanyl is addictive, so it should be used correctly under the guidance of physicians. The side effects of fentanyl will make the body produce drug dependence, which will produce nausea, respiratory depression, and even respiratory amnesia and other symptoms. Fentanyl is contraindicated in people with bronchial asthma, myasthenia gravis, pregnant women, and heart disease. The use of fentanyl needs to be standardized under the guidance of a doctor, do not use the drug privately to cause addiction.