Actually, Tamiflu is derived from the Chinese star anise pod.
My 13 year old son developed the H1N1 flu and took Tamaflu. He was sick for 4 days. My wife caught it and took Tamiflu and was sick for 3 days.
While picking up the Tamiflu for my son, I went to Whole Foods and bought some star anise and ground it up in my coffee grinder (wash it afterwards!) and took a spoonful chased by OJ during the whole process.
I did not get the flu.