Valtrex is an antiviral drug. It slows the growth and spread of the herpes virus so that the body can fight off the infection. Valtrex will not cure herpes, but it can lessen the symptoms of the infection. Valtrex is used to treat infections caused by herpes viruses. Illnesses caused by herpes viruses include genital herpes, cold sores, shingles, and chicken pox. Valtrex may also be used for other purposes not listed in this medication guide.

What is the most important information I should know about Valtrex?

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

Valtrex 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 Valtrex.

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

Herpes virus can be passed from an infected mother to her baby during childbirth. If you have genital herpes, it is very important to prevent herpes lesions during your pregnancy so that you do not have a genital lesion when your baby is born.

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

Avoid sexual intercourse or use a latex condom to prevent spreading the virus to others. Avoid letting infected areas come into contact with other people. Avoid touching an infected area and then touching your eyes. Wash your hands frequently to prevent passing the infection to others.