Drug Uses

Valtrex is used for treating shingles (herpes zoster), cold sores (fever blisters or herpes labialis), and treating or suppressing genital herpes in patients with normal immune systems. It is also used to suppress genital herpes in patients with HIV infection.

How to use

Use Valtrex as directed by your doctor. Check the label on the medicine for exact dosing instructions.

Take Valtrex by mouth with or without food. If stomach upset occurs, take with food to reduce stomach irritation.
Drinking extra fluids while you are taking Valtrex is recommended. Check with your doctor for instructions.
To treat cold sores, shingles, or genital herpes, start treatment as soon as possible after your symptoms start.
If treating an acute outbreak, continue using Valtrex for the full course of treatment, even if you feel better in a few days.
For suppressive therapy, Valtrex works best if it is taken at the same time each day.
Drug Class and Mechanism

Valtrex is an antiviral. It works by stopping viral replication. However, Valtrex does not eliminate the virus, it is not a cure. When used as a suppressive therapy in patients with normal immune systems with genital herpes using safer sex practices, the risk of spreading the infections to others is reduced.

Missed Dose

If you miss a dose of Valtrex , take it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do not take 2 doses at once.

Storage

Store Valtrex at 77 degrees F (25 degrees C). Brief storage between 59 and 86 degrees F (15 and 30 degrees C) is permitted. Store away from heat, moisture, and light. Do not store in the bathroom. Keep Valtrex out of the reach of children and away from pets.

Warnings/Precautions

Do not use Valtrex if:

you are allergic to any ingredient in Valtrex or to acyclovir.

Contact your doctor or health care provider right away if any of these apply to you.

Some medical conditions may interact with Valtrex . Tell your doctor or pharmacist if you have any medical conditions, especially if any of the following apply to you:
if you are pregnant, planning to become pregnant, or are breast-feeding
if you are taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement
if you have allergies to medicines, foods, or other substances
if you have had a bone marrow or kidney transplant
if you have HIV or AIDS
If you have kidney problems
Some MEDICINES MAY INTERACT with Valtrex . However, no specific interactions with Valtrex are known at this time.

Possible Side Effects

Check with your doctor if any of these most common side effects persist or become bothersome:

diarrhea; dizziness; headache; nausea; stomach pain; vomiting.
Seek medical attention right away if any of these severe side effects occur:
severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); aggressive behavior; bloody or dark urine; confusion; fever; hallucinations; pale skin; pinpoint bruises; seizures; shaky movements; speech problems; unsteady movement; weakness; yellowing of the skin or eyes.
More Information

If you have any questions about Valtrex, please talk with your doctor, pharmacist, or other health care provider.

Valtrex is to be used only by the patient for whom it is prescribed. Do not share it with other people.

If your symptoms do not improve or if they become worse, check with your doctor.