influenza
"I began taking Tamiflu at about the 72 hr mark. They say this is borderline that it can help at this stage. I felt so bad (headache, body aches, hot/cold, cough) that the doctor decided to try it. After 2 doses, fever broke, aches are gone and only slight coughing. Still a little fatigued. Wasn't sure this would work... But I believe it now."