Affilicted with severe cold sores since childhood, tried everything in the early years, about 20 years ago begged Dr. for prescription of Zovirax which had been approved for genetal herpes (not cold sores). Worked. Have taken 400 mg daily since that time. Take one tablet at night, never any problems, once in a while even on that dose I may have symptoms, and I up the dose to 3 tabs of 400 mg. ...
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