I'm sorry - I didn't mean to pry.
Just in case, here are the main listed side effects
( acyclovir is made up of practically the same molecular structure )
"Headache, Diarrhea, Confusion, Decreased kidney function
Dizziness, Nausea and vomiting, Abdominal Pain, Disturbances of liver function "
Although the liver disturbances aren't mentioned on the valtrex webpage, it's worth taking a look at what's written.