Febrile illness: A fever of 39.9 c is quite high, but can happen with certain viral illnesses or other infections. Influenza is a common cause of high fever and sore throat at this time of year and fever can "break through" tylenol/acetaminophen. If fever persists or other symptoms develop, see your doctor! fever 2 hours after tylenol can often be controlled with 400 mg (2 otc tablets) of ibuprofen.
Answered 12/22/2013
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