cold sores
"This drug, along with its predecessor, acyclovir, is a godsend.  If you ever suffered breakouts, you know how embarrassing it is to go about your day with a cold sore.  If you have to spend the workday talking to people, it's even worse.  My breakouts were usually a week long, with the residual scar visible for another few weeks.  I take famciclovir at the earliest opportunity.  Caught early, I'm even able to stop a full breakout, and only redness remains left to be healed.

This drug works so well, I am puzzled by the "remedies" peddled on TV, the internet, and health food stores (Abreva, Bactine, essential oils, lip balms, etc.). Famciclovir/acyclovir is the only thing that has worked for me."