I've been getting cold sores for as long as I can remember. I have never been tested for HSV 1 but always assumed that's what it is. I used to only get 1 or 2 every year or two. But, recently they have been more and more frequent. I used the 200mg acyclovir at times when I felt I was getting an OB and it worked very well. Although, there have been times, once or twice, when it did not work and I experienced the worst OB's I've ever had. I have a pretty bad one now (ran out of meds) and I went to the Dr. yesterday and he said with the more frequent OB's he was going to prescribe me 400mg acyclovir to take twice daily for suppression. My question is, how much of a reduced number of OB's should I expect and does taking this medication cause any birth defects as my wife and I are talking of maybe having another child. Thanks in advance.