Amantadine (100capsules in a bottle) as a form of protection. If I know I am going to be around someone who is sick, or was near someone who sneezed during the day, I will pop an Amantadine as an insurance policy. When I actually start to feel the possibility of an infection starting, I will then start with a cycle of Tamiflu (7 day cycle I think, you have to take all the pills once you start).
I am extra careful of this as a cold/flu was previously my only trigger for a relapse. There is no way of really knowing that it works or not, but I can say I have not had a full blown flu for over a year. I actually can not remember the last.