Fever-reducing medications, like acetaminophen or ibuprofen, work temporarily to lower your body temperature, but they do not cure the underlying infection. Once the medication wears off?usually after four to six hours?your body's immune system naturally raises your temperature again to continue fighting off the virus or bacteria. This cycle is very common and is a sign that your body is actively working to heal. Please rest, drink plenty of fluids, and give your body time. If your fever lasts more than three days or worsens, please consult your doctor.
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Why does my mild fever and weakness keep coming back a few hours after I take fever-reducing medicine?