medication for cold sores in mouth
Several medications, including Valtrex, are available to treat cold sores. Some are used topically (on the skin) and others are orally (by mouth), but the goal is to treat cold sores as early as possible.
Why Acyclovir Helps Cold Sores. Zovirax (Acyclovir 5 percent cream) is also FDA-approved for the treatment of recurrent cold sores. In studies, frequent application of the cream reduced the time to healing by about 12 hours.