 [ Symptoms ] how long does it take to get rid of flu with tamiflu my dr prescribed me tamiflu on tuesday and a week later i am still getting terrible headaches and fever around 102 is this normal [ Disease ] no it is not normal influenza assuming your diagnosis was correct only lasts a week if you do not treat it a few days less if you take tamiflu tamiflu does not cure the flu it just shortens the course if you are still having headaches and fever you will need to see your medical provider again