herpes simplex
"I had a sudden onset of cold sores and a new one was appearing each day. I am on immunosuppressants so my body just can't fight this virus on its own. After 5 days I went to my doctor.
This medication was amazing- within 24-48 hrs the blisters were crusting over. The swelling and redness was decreasing as well. 
I am on 400 mg 3 x daily for 10 days. I am currently on day 6. 
For the first few days I would feel lightheaded (not dizzy) for a few hours after each dose, but that has gone away now. No nausea when taken with food. I did have a few mild headaches, but that was because I was not drinking enough fluid. As soon as I hydrated, headaches were gone.
My doctor gave me 2 refills so next time I feel the onset I can start treatment right aw"