Hello my 4 year old son has a fever with a headache now for 3 days. He looks dehydrated, dr gave him fever reducer but does nothing what is this?

Confusing question. Does he look dehydrated to you or the physician?Has he seen the physician today? Has he urinated in the past 6 hours? If he has not urinated in 8 hours & looks dehydrated he should see the physician today for an evaluation. I hospitalize kids for IV fluids if they are dehydrated.