Valacyclovir
"This medicine works period. 
I've always had cold sore or for as long as I can remember.
On 2/2/16 I felt that tingling we all know about. And remembered my primary Doc had given me a prescription. He told me to keep it handy. I took two in the morning 1 mg each and two in the evening. 
I can't say how happy I am. By the second day I usually won't leave the house because my lip gets so big I can't even speak or laugh. Well today is my second day and my cold sore is barely noticeable. I wish I could post pics. It's amazing. The only side effect I got was a weird headache, but I can put up with a headache if the results are amazing like what I got. Ask your doctor for this if you haven't yet. Love it, love it, love it!"