When you have HSV-1 orally, it's true that the virus is most contagious during outbreaks or when symptoms are present. Taking Valtrex can help reduce the risk of transmission even when there are no visible sores by lowering viral shedding levels. However, while on medication and without any symptoms, there is still a possibility (though lower) of transmitting the virus to your partner through oral sex or kissing.

It's essential to communicate openly with your sexual partners about your condition and take precautions like using protection for genital contact if engaging in activities where transmission could occur. Discussing these concerns with a healthcare provider may provide more personalized guidance based on your specific situation.