A member asked:

How fast does acyclovir work on cold sores?

A doctor has provided 1 answer

Depends...: ...On the time lag between breakout and start of treatment. After 3 days may not work at all.

Answered 8/2/2014

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Should acyclovir (zovirax) 400 mg work on cold sore?

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How fast does acyclovir work?

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