Because of this unique delivery system, you get more active
acyclovir in the body to kick some herpes butt.
Acyclovir works the same, you just have to take it 2x/day compared to once daily. I know with my insurance I pay under $20 for a 3 month supply which makes it WAY worth taking a pill 2x/day instead of once daily! If you look on the valtrex prescribing info, it compares it's efficacy with acyclovir even - http://us.gsk.com/products/assets/us_valtrex.