How to Treat a 5-Year-Old Child’s Fever That Lasts for a Day and a Half?

A 5-year-old child has been running a fever for a day and a half, with a temperature of 39.5°C. After taking Mefenamic Acid, the fever recurs. There are white blisters in the mouth, sore throat, and the child is afraid to drink water. There is occasional coughing. The tongue is slightly yellow due to the medication, and the white blisters are noticeable. How should medication be prescribed? Do you need to go to the hospital for a blood test?
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