influenza
"From reading through these comments, it seems a large consensus that TamiFlu causes nausea and stomach aches. For me, this was not as severe as some other commenters have experienced. I also experienced "spaciness", grogginess, and vivid dreams. 

I was exposed during thanksgiving from some family members who tested positive, and five days later no symptoms. Thanks Tamiflu!

I also wonder how much of these flu-like symptoms commenters think are "from" Tamiflu, but are actually from the flu virus."