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Valtrex is an antiviral medicine that contains the active substance valaciclovir. It is used to treat infections with herpes, including varicella zoster which causes shingles and herpes simplex viruses (HSV) which can cause cold sores or genital herpes.
Valaciclovir is a simple, easy-to-take medicine that helps calm viruses like cold sores and shingles by slowing them down so your body can heal faster. It won’t cure the virus for good, but it can shorten pain and help you feel more comfortable sooner.
Info last reviewed 17/10/2026
Category: Antibiotics, Antifungals & Antivirals | Tags: Herpes, STD