The main ingredient of Merlin is ibuprofen, which is a non-steroidal anti-inflammatory drug with strong fever-reducing and pain-relieving effects. If you take too much Merlin, it may cause some gastrointestinal discomfort, such as nausea, vomiting, acid reflux, heartburn, in addition, serious ulcers in the gastrointestinal tract, or even stomach bleeding. In addition, Merlin overdose may lead to liver function damage and elevation of transaminases. Some neuropsychiatric symptoms may also occur, including headache, dizziness, drowsiness, and nervousness. In the most severe cases, it may lead to an increased metabolic burden on the kidney, causing acute renal papillary necrosis and even renal failure. Therefore, the use of Merlin must be taken strictly in accordance with the dose, and the drug should not be taken more than four times in a day, and the single dose should be calculated according to the weight and age of the patient.