herpes simplex, mucocutaneous/immunocompromised host
"I am on a regimen program of Valtrex and I take 4 tablets on the onset of fever blister of the lips then 4 tablets 12 hours later.  Then, My Doctor prescribed 1 Valtrex daily forever.  It's well worth it.  I have not had any break outs since my Doctor put me on this prevention program.  I highly recommend Valtrex and am well satisfied with the results.  "