Cold Sores
"A few years ago I would have given this medicine a 10 but lately for me it has not been as effective as it used to be.  I got a breakout a few days ago and treated it with a Valtrex 1 day cycle.  Today I broke out with another cold sore even though I just took the medicine.  This has happened before too.  I will do another cycle but I don&#039;t know if it will help.  I will say that the sores are smaller when I take Valtrex but still last about 7 days.  Supposedly you cannot build a tolerance to this medicine but I seem to have."