Zilactin-L is a close second to abreva, and treats cold sores quickly and effectively. It dries the affected cold sore area, and if you catch it quick enough it will seem to get it before it becomes noticeable.
I have used Zilactin gel in the past and was unimpressed with the fact that it dried on your lip to a yellow color, and looked very unattractive, and the taste was awful. I saw this product, and realised that it was a liquid, so I decided to give it a try.
It provided great relief for the painful cold sore that I had, and I had indeed caught it early, and it prevented the cold sore from surfacing. From the moment I applied the oral topical solution I felt relief, so this was true to the packaging.
It didn't leave a residue on my lip, and was comforting as well as easy to apply with the nozzle on the top. Being a liquid, it was difficult to apply without any dripping, but this improved when I used a cotton swab to apply to my lip.
A good backup product when I was unable to find the usual, it will stay in my medicine cabinet until I require it again!