A member asked:

When im feeling a cold sore coming, is it ok to take lysine supplement with my emergency dose of valtrex( 8 pillsx 2times-12 hours )...?

2 doctors weighed in across 2 answers
Dr. Jane Lykins answered

Specializes in Family Medicine

ABSOLUTELY!!: I think L-lysine is a very effective anti-viral supplement and you should start taking it the minute you feel a tingle of an outbreak, or whenever your immune system is knocked down, like with a cold or extreme stress. Only use it for 7-10 day periods, however, because you can down-regulate your immune system with constant use.

Answered 3/1/2016

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It's just fine: It is just fine to take lysine with Valtrex (valacyclovir) and daily lysine can help prevent outbreaks.

Answered 2/18/2015

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