Yesterday was day 1 on famvir. I don't expect to having to many side effects yet but I am scared I will get more sick before I get any better. I still work (very sedentary job with flexible hours) so I am scared that I will be forced to quit working. However, I have already been needing to slow down on working, if not quit due to how ill I am. I have read numerous posts about others taking famvir but my brain fog is so bad that I miss most of what I am reading. Can anyone give me their rundown of side effects and the timeframe from first dose of famvir? I really appreciate everyones advice and help.