Famciclovir
"A friend told me about these tablets the last time i was suffering from a cold sore.  At the time it was already too late to take the meds cos it was in full force so I kept the idea in mind for next time.  Last Tuesday early morning I felt the coldsore coming out, went to the chemist as soon as it opened and took the 3 tablets (1500mg).  By Thursday it was already crusting up and by Saturday (had a wedding to attend) I could cover it up with make up pretty well. I cannot believe how quick this medication works, it saved me a whole week of suffering unnecessarily, not to mention saved me from the embarrassment at my friends wedding. Now I have a spare packet at home, this will change my life!"