cold sores
"For those who are prescribed Valtrex who then report they have not gotten relief--make sure your next prescription is not filled with the generic version.  That happened to me, I had been taking Valtrex for about 10 years with great success.  Then it stopped working to my dismay.  I realized the prescription bottle contained the generic version.   I had to go back to my dr and explain the generic version's ineffectiveness on me and to specify NO GENERIC. I'm back on Valtrex and it works wonderfully."