I had took 2 gram of valtrex for over 6 days. I did'nt take 2.5gram as I am too busy at work, so only day and night. On the 4th day, I had more outbreak, but not uncontrollable by valtrex. I think the viruses will grow more when notice attack. In fact, when I was having I.V. hydrogen peroxide, the viruses grow more. I stopped for 2 days of I.V., and continue. So for valtrex, one can stop for one or two days and continue.