The dosage of Merlin should be calculated according to the weight in kilograms, generally for children aged 1-3 years weighing about 10-15 kg, the dosage is 4 ml at a time. However, it should be noted that Merlin can be repeated at intervals of 4-6 hours and not more than 4 times in 24 hours. If Merlin is used as an antipyretic, it is best not to use it for more than 3 days, and not to use it for pain relief for more than 5 days.