Centrex containns Valacyclovir which belongs to the class of medications known as antivirals. It is used to treat a viral infection affecting the skin known as shingles (herpes zoster).
It is also used to treat cold sores, and to treat and prevent recurrences of genital herpes.
It works by interfering with the way the virus reproduces. Valacyclovir works by stopping the virus from multiplying and spreading to nearby healthy cells.
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