Dec 16, 1999
I am on Famvir, a prophylactic dose of 125mg once daily. I am supposed to double the dose for ten days if I have symptoms. It doesn't seem to be working.
Is Valtrex (valacyclovir ) more effective? What about resistance? Famvir and Valacyclovir work differently, but I don't know if that is sufficient to prevent cross resistance. Also, how does Valacyclovir rate in the bone marrow suppression department? My RBC is low already.
I am asking you this information, because my doctor is in a practice that services HMOs and seems to have trouble keeping on top of these things.
Response from Dr. Feinberg
It is unusual for recurrent herpes to cause fever and fatigue, so the first thing to do is to make sure that what you are experiencing is really herpes simplex. This can easily be done by having a lesion cultured when it is still fresh. Another possibility is that it is indeed herpes but is no longer responding to the Famvir because the dose is too low. The usual dose for suppression of frequent recurrences is 250 mg every 12 hours. It is possible that you will respond to this higher dose. If you don't, your herpes may have become resistant.
Valtrex may also be effective. There are no data comparing the 2 drugs in HIV+ patients, so it's not easy to say which one would be better. Valtrex does not usually suppress the bone marrow.
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