The main ingredient of Merlin is ibuprofen, a non-steroidal anti-inflammatory drug with antipyretic and analgesic effects. When fever patients use this product, it is generally recommended to use it when the body temperature exceeds 38.5℃, and it will work about 1-1.5 hours after taking it. This product should be used once every 4-6 hours and not more than four times in 24 hours for fever reduction, and not more than three days in a row for pain relief, and not more than five days in a row for pain relief. If the symptoms are not relieved after several doses, you should go to the hospital for regular consultation and treatment in time. Ibuprofen works mainly by inhibiting the synthesis of prostaglandins, and is a safer antipyretic drug that can be used by both adults and children. The advantage of this drug is that the fever reduction is smooth and long-lasting, the average control of fever reduction time is about 6-8 hours, and it is more effective for high fever reduction above 39℃. It has mild gastrointestinal reactions, some patients may experience symptoms such as burning sensation in the stomach, nausea, vomiting, etc. Occasionally, rash, headache, tinnitus, elevated transaminases, affect the performance of coagulation function, and has also been reported to cause gastrointestinal bleeding and aggravate ulcers, so it should be monitored during use.