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Valtrex

Valtrex (valaciclovir) is an antiviral medication used to treat and manage genital herpes, cold sores, shingles, and chickenpox. It works by inhibiting the herpes virus’s replication, reducing the duration of outbreaks and helping to prevent future occurrences.

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January 6, 2026

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Valtrex (valaciclovir) is an antiviral medication used to treat and manage genital herpes, cold sores, shingles, and chickenpox.

Review Title

Effective Treatment for Herpes Infections
Prevents Future Outbreaks
Reduces the Risk of Transmission

Valtrex

Category: Genital Herpes Treatment

Frequently Asked Questions for Valtrex

What It Is

Valtrex is an antiviral drug used to treat herpes simplex virus (HSV) infections, including genital herpes, cold sores, shingles, and chickenpox. The active ingredient, valaciclovir, converts into aciclovir in the body, where it works to prevent the virus from replicating, speeding up recovery and reducing symptoms.

How It Works

Valtrex works by converting into aciclovir once inside the body. Aciclovir blocks the viral DNA polymerase enzyme, which the herpes virus needs to replicate. By inhibiting this enzyme, Valtrex helps prevent the virus from multiplying, reducing symptoms, and allowing the immune system to control the infection more effectively.

How It Is Used

For genital herpes outbreaks: Take 500mg twice daily for 5 to 10 days.

Side Effects

Common side effects (may affect up to 1 in 10 people):

Headache
Nausea
Stomach pain
Dizziness

Uncommon side effects (may affect up to 1 in 100 people):

Rash
Vomiting
Diarrhoea
Fatigue

Serious side effects (may affect up to 1 in 1000 people):

Severe allergic reactions (swelling of face, lips, tongue, or throat)
Confusion or hallucinations
Severe skin reactions (blistering or peeling)
Kidney problems (reduced urine output or blood in urine)

If you experience any of these severe side effects, seek medical attention immediately.

Warnings and Precautions

Allergy: Do not take Valtrex if you are allergic to valaciclovir or any of the other ingredients in the tablets.
Kidney or Liver Conditions: If you have kidney or liver issues, inform your doctor before using Valtrex.
Weakened Immune System: If you have a weakened immune system, consult your doctor before starting treatment.
Pregnancy and Breastfeeding: Valtrex is not recommended during pregnancy or breastfeeding unless advised by your doctor.
Hydration: Drink plenty of water while taking Valtrex to stay hydrated and protect your kidneys.
Always follow your doctor’s instructions carefully and do not exceed the prescribed dose.