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Valtrex 500mg 20 tablet (outbreak)

Valtrex 500mg 20 tablet (outbreak)

Valtrex 500mg 20 tablet (outbreak) Product information

£63.99

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Product Information for Valtrex 500mg 20 tablet (outbreak)

Buy Valtrex Online in the UK

Valtrex (Valaciclovir) 500mg is a treatment for Cold Sores. It is a prescription-only medication.

Symptoms of this condition start with a tingling, itching or burning sensation around your mouth. Small fluid-filled sores then appear, usually on the edges of your lower lip.

It works by killing or stopping the growth of viruses called herpes simplex and is effective for treating cold sores (In adults and adolescents over 12 years old).

Valtrex (Valaciclovir) is not usually recommended for use during pregnancy. If you are pregnant, think you could be, or plan to become pregnant, don’t take Valtrex (Valaciclovir) without checking with your doctor.

It should not be taken by people who are allergic to valaciclovir or aciclovir or any of the other ingredients of this medicine.

For more information, you can visit the NHS Choices Website.

 

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How to use Valtrex 500mg 20 tablet (outbreak)

Valtrex 500mg tablets for a cold sore outbreak 

ONE to be taken TWICE a day for FIVE days treatment can continue for an additional FIVE days if new lesions occur during treatment.

Side effects of Valtrex 500mg 20 tablet (outbreak)

Like all medicines, this medicine can cause side effects, although not everybody gets them. The following side effects may happen with this medicine:

Conditions you need to look out for:

  • severe allergic reactions (anaphylaxis). These are rare in people taking Valaciclovir.

The rapid development of symptoms includes:

  • swelling of the lips, face, neck and throat, causing difficulty in breathing (angioedema)

  • fall in blood pressure leading to collapse

  • flushing, itchy skin rash

If you have an allergic reaction, stop taking Valaciclovir and see a doctor straight away

Very Common (may affect more than 1 in 10 people):

  • headache

Common (may affect up to 1 in 10 people)

  • feeling sick

  • rash

  • itching (pruritus)

  • dizziness

  • skin reaction after exposure to sunlight (photosensitivity).

  • vomiting

  • diarrhoea

Uncommon (may affect up to 1 in 100 people)

  • feeling confused

  • feeling very drowsy

  • tremors

  • seeing or hearing things that aren’t there (hallucinations)

  • feeling agitated

Please read the patient information leaflet for more information on side effects.
Patient Information Leaflet

Important - Before taking any medication, it is always important to read the Patient Information Leaflet (PIL)

Valtrex 500mg 20 tablet (outbreak) - Patient Information Leaflet

References

Message From Our Pharmacist

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Authored on February 16, 2026

Robert Bradshaw (Pharmacist)

Reviewed on February 16, 2026

Kiran Jones

Kiran Jones - MPharm, MRPharmS

Pharmacist / Medical Content Writer

GPhC Number: 2071585