Famciclovir
"Outbreak commenced on Sunday - I took the 1500mg dose as soon as I suspected it was a cold sore. The outbreak progressed and on Monday I could feel/see the bumps/redness and the itching was getting much worse. Today (Tuesday) the bumps are nearly gone and the redness is abating with no abnormal sensations. Wonderful to have this product after 30 years of living with cold sores that last for 14 days from start/finish."