Valtrex (Valacyclovir) is used to treat herpes zoster (shingles) and genital herpes. It does not cure herpes infections but decreases pain and itching, helps sores to heal, and prevents new ones from forming. This medication is sometimes prescribed for other uses; ask your doctor or pharmacist for more information. Valacyclovir (Generic) is available for purchase. 

Valacyclovir comes as a tablet to take by mouth. It is usually taken every 8 hours (three times a day) for 7 days to treat shingles. To treat genital herpes it is usually taken twice a day for 5 days. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take valacyclovir exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor. Use this medication as soon as possible after symptoms appear. Continue to take valacyclovir even if you feel well. Do not stop taking valacyclovir without talking to your doctor.

Before taking valacyclovir,

• tell your doctor and pharmacist if you are allergic to acyclovir (Zovirax), valacyclovir, or any other drugs.
• tell your doctor and pharmacist what prescription and nonprescription medications you are taking, especially cimetidine (Tagamet), probenecid (Benemid), and vitamins.
• tell your doctor if you have or have ever had kidney or liver disease, problems with your immune system, human immunodeficiency virus infection (HIV), or acquired immunodeficiency syndrome (AIDS).
• tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking valacyclovir, call your doctor.

Valacyclovir may cause side effects including:

• headache
• upset stomach
• vomiting
• diarrhea or loose stools
• constipation

Tell your doctor if any of these symptoms are severe or do not go away. If you experience any of the following side effects, call your doctor immediately:

• rash
• itching
• confusion
• yellowness of the skin or eyes
• fever
• blood in the urine

Q: Why is Valtrex prescribed?

A: Valtrex is used to treat infections caused by herpes viruses, including shingles, genital herpes and cold sores.

Q: Does Valtrex have a generic alternative?

A: Valacyclovir (Generic) is available for purchase. 

Q: What if I miss a dose of Valtrex?

A: Take the missed dose as soon as you remember it, and take any remaining doses for that day at evenly spaced intervals. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Do not take a double dose to make up for a missed one.

Q: How should I store this medication?

A: Valtrex should be kept in the container it came in, tightly closed, and out of reach of children. Store it at room temperature and away from excess heat and moisture (not in the bathroom).