Famciclovir
"OMG!! I am a 55 year old lady who has suffered cold sores all my life.  I have regular outbreaks over the past few months, each lasting up to 2 weeks.   Broke out Sunday arvo, pharmacy Monday morning.  Within 2-3 hours the redness, tingling, pain had settled.  By the afternoon the blister had started to dry up and was not so angry looking.  I have never used this before and  I am "blown away" by how quick this worked after one dose.  Brilliant"