Valtrex

Uses of Valtrex

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

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

Valtrex 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.

Valtrex 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.

Precautions and Warnings

Before taking Valtrex, 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.

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).

Stop taking Valtrex 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 bruising or bleeding, red spots on the skin (not related to herpes or chickenpox), bloody diarrhea, vomiting, pale or yellowed skin, weakness, fainting, or urinating less than usual or not at all.

You should not use Valtrex if you are allergic to valacyclovir or acyclovir (Zovirax).

To make sure Valtrex is safe for you, tell your doctor if you have:

• kidney disease (or if you are on dialysis);
• HIV/AIDS, or other conditions that can weaken the immune system; or
• a history of kidney transplant or bone marrow transplant.

While Valtrex use in pregnant women is limited, there is no evidence of major risk to the human fetus from valacyclovir. However, 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.

Valacyclovir can pass into breast milk and may harm a nursing baby. Tell your doctor if you are breast-feeding a baby.

Do not give this Valtrex to a child without medical advice.

Dosage

Take Valtrex exactly as it was prescribed for you. Follow all directions on your prescription label. Do not take this medicine in larger or smaller amounts or for longer than recommended.

Start taking Valtrex as soon as possible after the first appearance of symptoms (such as tingling, burning, blisters). This medicine might not be as effective if you first start taking it 1 or 2 days after the start of your symptom.

Some herpes infections need to be treated for longer than others. Use this medicine for the full prescribed length of time. Your symptoms may improve before the infection is completely cleared. Skipping doses may increase the risk of your virus becoming resistant to antiviral medicine.

Side Effects

Common side effects:

• nausea, stomach pain; or
• headache.