Famciclovir More Drug_uses What Is The Best Cold Sore Medication?

What is the best cold sore medication? - famciclovir more drug_uses

I've heard are acyclovir, famciclovir and valacyclovir.
I know you coldsores the sun, and I take medication every day for them. I have only 2.3 cases per year and they are always in the summer.
There are other ways to prevent cold sores? Ive heard a sunscreen lip helps.and suggestions?
Thank you in advance.