Q: I know Valtrex is prescribed to treat genital herpes. If someone is exposed to a partner with herpes, will taking Valtrex right away destroy any of the virus that may have been acquired before it has a chance to take hold and become dormant? In other words, can Valtrex be used as sort of a "day after" medication?
A: We were intrigued by the idea that Valtrex might protect someone against genital herpes, so we asked the manufacturer, GlaxoSmithKline. GSK has never done a study to investigate this scenario. As a result, there aren't any clinical data to support the use of Valtrex as a "day after" medication or as a prophylactic drug in uninfected individuals whose sexual partners have genital herpes.
http://seattletimes.nwsource.com/html/health/2008173256_pharmacy14.html
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