Famciclovir
"Didn't do anything at all. Used it basically at the first sign of tingling, in combination with Zovirax. Both useless, ended up with a massive lesion on my lip that is still growing. Not sure why it's worked for other people and not me! Worst $30 spent. My home remedy of burning the beginning of the sore with Methylated spirit and Peroxide did a much better job for me in the past."