Valtrex
"Valtrex is truly the only cold sore medication that will act fast and diminish your pain and blisters within days You will start feeling relief in hours. No other cold sore medication can compete. The only downside is  you have to get a prescription for it. Depending on your insurance it could be fair to pricey. If you are like me and suffer from HSV 1 & 2  ask your doctor for 30-60 tablets. Most doctors will only prescribe the recommended dosage for treatment. (5 tablets) with 1 refill. It's such a pain having to go back to doctors when you have a simple outbreak. This will ensure a good supply for whenever you might need it. Always works FASTEST when taken at first sign of sore."