Well, Valtrex only prevents the SYMPTOMS of herpes -- as in, cold sores -- it cannot prevent transmission, per se.
If you suspect you have oral herpes, you should see your doctor regardless. And if you and your partner are not keeping current with your yearly STI screenings -- especially if you haven't been practicing safer sex with latex barriers -- then you BOTH should do that as well, regardless.
If you do, in fact, have oral herpes, you can talk to your doctor about medications like valtrex which help reduce the number of coldsore breakouts, and you can also ask about how to start practicing safer sex AND about how to be aware of when an outbreak may be coming. Per giving yourself genital herpes from your own oral herpes, that's not so likely, but CAN be an issue if, for instance, you have oral herpes, give IT to a partner (or your partner already had it), and then they transmit herpes to you genitally. But again, all of these things can be asked directly of your general physican or gynecologist.
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