Aciclovir - Zovirax treatment for cold sores

Zovirax cold sore cream is used in the treatment of cold sores that are caused by Herpes Simplex Virus (HSV) infection. The active ingredient in this medication is aciclovir, which works to prevent the virus from reproducing, thereby blocking infection. This cream is not meant for treatment of general herpes, and is only recommended for the treatment of cold sores or infections of the lip. Best results are seen when the medication is begun as soon as the symptoms appear.


  • Do not bring the cream in contact with the eyes.
  • Use only for external application.
  • Do not use for application to the eye, inside the mouth or vagina or other mucous membranes.
  • Remember to wash your hands thoroughly before and after each application.
  • This medication is not meant to be used to treat infections in patients who have a severely weakened immune system, like people with AIDS, or those who have just undergone a bone marrow transplant.
  • Do not use if you are allergic to any of the ingredients in this medication.
  • If you experience an allergic reaction, discontinue use and consult your physician immediately.
  • Caution should be exercised while using the medication during pregnancy. Your doctor will advise you regarding the benefits to the mother verses risk to the foetus.
  • The medication has been found to pass to the infant through breast milk, but in minute quantities that are not likely to cause harm to the foetus. Seek the advice of your doctor before taking this medication during breast feeding.

Side effects
The following side effects have been found to be linked with the use of this medication.

  • Widening of the small blood vessels may cause flushing of the skin. Contact dermatitis or an allergic inflammation of the skin may be seen.
  • There may be a burning sensation at the area where the cream is applied.
  • There may be itching or drying of the skin.

Medicine interactions
There have been no significant interactions found with other medications.