influenza
"Terrible. I am a senior.  I was not prescribed tamiflu until 3 days of onset. No problem with diarrhea but...I felt like I had been poisoned.  Total of 4 doses and the balance of the pills will never be taken again.  Cough worsened, fever worsened, overall aches and pains increased with each dose. Unable to sleep, and now a pounding headache.  Maybe I should not have been prescribed Tamiflu so late into my symptoms. Horrible experience."