Docosanol
"I usually get cold sores twice a year, but this year they've appeared way more. I usually have Valtrex and they dissapeared in hours, but this time I had run out of them. So when i first noticed a single blister between my lip and chin I run to the pharmacy to buy Abreva. I applied it as indicated and sadly it didn't work for me at all. It might work for some as medicines are like that, but for me it didn't do anything at all."