Valacyclovir
cold sores
"This is the third time that I have gotten a cold sore. The first two times I tried to make it go away on its own. I tried everything from tea tree oil to Abreva. Since my cold sore started with a tingle on Saturday night, I couldn't get to my doctor until Monday morning. By that time I had two cold sores on my lower lip, millimeters apart and my lip was swollen to the size of a grape.  He gave me 1 gram valacyclovir, twice a day. By that night I noticed that the first cold sore had a scab and that it shrunk in size.  The next morning all of the swelling was gone and the cold sores were The second blister didn't pop yet but it looked like it was getting smaller. Although they say to take this medicine when you first feel the cold sore coming"