The generic name for Merlin is Ibuprofen. Merlin is more effective in reducing fever and has a better safety profile. After a child has taken Merlin, the fever-reducing effect begins to appear slowly in half an hour. However, whether the child’s fever-reducing effect is good or not also depends on the following ways: 1. If the child is not sufficiently hydrated after taking Merlin, the fever-reducing effect will not be too good. Due to the child’s long-term fever, resulting in the lack of water in the body, because the antipyretic drugs have to go through the effective moisture, through the child sweating to achieve the purpose of effective fever reduction. If the child is lacking in water, the effect of fever reduction is poor, then we should give the child timely replenishment of water. 2, to pay attention to keep warm. If the child is in a cold environment, the pores can not be effectively opened after eating antipyretic drugs, and thus can not reduce fever.