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Valacyclovir
  • Treatments
  • Herpes Zoster

Valacyclovir

Generic name: valacyclovir [ val-a-SYE-kloe-veer ]
Brand name: Valtrex
Drug class:Purine nucleosides

Medically reviewed by Sanjai Sinha, MD. Last updated on Apr 1, 2021.

What is valacyclovir?

Valacyclovir is an antiviral drug. It slows the growth and spread of the herpes virus to help the body fight the infection.

Valacyclovir is used to treat infections caused by herpes viruses, including genital herpes, cold sores, and shingles (herpes zoster) in adults.

Valacyclovir is used to treat cold sores in children who are at least 12 years old, or chickenpox in children who are at least 2 years old.

Valacyclovir will not cure herpes and will not prevent you from spreading the virus to other people. However, this medicine can lessen the symptoms of an infection.

Warnings

Before taking valacyclovir, tell your doctor if you have HIV/AIDS, a weak immune system, kidney disease (or if you are on dialysis), or if you have had a kidney or bone marrow transplant.

Valacyclovir can be harmful to the kidneys, and these effects are increased when it is used together with other medicines that can harm the kidneys. Tell your doctor about all other medications you are using. You may need dose adjustments or special tests when taking certain medications together with valacyclovir.

Treatment with valacyclovir should be started as soon as possible after the first appearance of symptoms (such as tingling, burning, blisters).

Valacyclovir will not prevent the spread of genital herpes. Herpes infections are contagious and you can infect other people even while you are taking this medicine.

Stop taking valacyclovir and call your doctor right away if you have any signs of a serious side effect that can harm red blood cells, such as: fever, easy bruisin...