Both Famciclovir and Valtrex are commonly used treatments for cold sores caused by the herpes virus. While there is limited comparative data between the two medications, they are both effective in reducing the frequency of outbreaks. It may be beneficial to take Valtrex daily as a preventive measure, so that you have the medication on hand in case a cold sore appears. Ultimately, the choice between Famciclovir and Valtrex should be based on the individual's response to the medication and any potential side effects.
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