• Aciclovir
  • Aciclovir

Images are for illustration purposes only.


  • Medication features

    • Available in 400mg tablets
    • Antiviral medication used to treat genital herpes
    • To be taken as outbreak or suppression medication


NOTE: After selecting this product, you will need to complete a short assessment, so we can make sure this medication is suitable for you.

Aciclovir is an antiviral medication that prevents herpes infections from multiplying. This medication works to decrease the severity and duration of genital herpes outbreaks. Most benefits of this treatment are experienced if taken as soon as the first symptoms appear. Aciclovir can also be taken to prevent outbreaks in people that suffer from recurrent outbreaks.

Patient Information Leaflet (from EMC):



Start taking aciclovir as soon as possible after your symptoms begin. Swallow the tablet whole with a glass of water, with or without food, three times a day for 5 days. When used to prevent genital herpes outbreaks, the tablet should be taken twice daily


  • How long does it take for Aciclovir tablets to work?

    Aciclovir starts working immediately after taking the tablet and is most effective if taken within 48 hours of initial symptom onset.

  • What is the difference between Aciclovir and Acyclovir?

    The only difference is the spelling. Aciclovir and Acyclovir are different names for the same antiviral medication. Aciclovir is the British English spelling, and Acyclovir is the American English spelling.

  • Can I buy Aciclovir tablets over the counter?

    No. All strengths of the aciclovir tablets (200mg, 400mg and 800mg) are only available on prescription in the UK. You can purchase aciclovir tablets through the ashcroft pharmacy following an online consultation. However, aciclovir cream is available over the counter under the brand name Zovirax.

  • Do I need to tell my partner?

    Herpes is a highly contagious disease, which is transmitted through skin on skin contact with affected areas during an outbreak. However it is still possible to spread the virus even when no symptoms are showing. Therefore, you should always be honest about your sexual history with your partner in order to prevent transmission of the virus. Always wearing a condom and not having sex during active outbreaks will minimise the risk of spreading the virus.

Side Effects

Side Effects:

  • Dizziness
  • Diarrhoea
  • Headache
  • Nausea
  • Abdominal pain
  • Fatigue
  • Skin rashes


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