1 mg may offer some benefit over 500 mg, but not much, our studies have shown. Too much Valtrex
or Lysine cannot cause yeast infections, no. Antibiotics have no influence on the
effectiveness of Valtrex. It is highly unlikely, now that you have established infection, that you would move your herpes to a new location on your body. Herpes should not cause your back and neck to feel like they are burning.