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Acyclovir, famciclovir, and valacyclovir are antiviral medicines used to treat genital herpes. All are effective. But because valacyclovir and famciclovir are absorbed better by the stomach, they can be taken less often than acyclovir. Antiviral medicines are usually taken by mouth (orally). But they are sometimes given intravenously (IV) in severe genital herpes outbreaks or herpes in newborns.
The topical form of acyclovir (Zovirax ointment) offers little benefit in the treatment of genital herpes and is not recommended.
Antiviral medicines may be given to:
Antiviral medicines may significantly reduce the severity of an outbreak of genital herpes and decrease the time it takes an outbreak to heal. The medicine also decreases the number of days of painful symptoms. And for some people, this medicine decreases the number of days you can spread the virus.
The amount and how often you take antivirals depends on the specific antiviral and whether you are taking them for a primary outbreak, recurrent outbreak, or for suppressive therapy.
Antiviral medicine is most effective if it is taken when you first notice the prodromal symptoms (tingling and pain) of a recurrent genital herpes outbreak and if it is taken for the next 5 to 7 days or until symptoms go away.
Some people with frequent recurrent outbreaks (more than 6 recurrences a year) take antiviral medicine every day (suppressive therapy) to help reduce the frequency and duration of recurrent outbreaks. Antiviral medicine can reduce the number of outbreaks by 70% to 80%.1
Research shows that an HSV-infected person in a heterosexual, single-partner (monogamous) relationship who takes valacyclovir daily in the doses used for suppressive therapy to prevent recurrent outbreaks reduces the risk of infecting his or her partner.2 Other antiviral medicines may also reduce transmission, but further study is needed.
If a genital herpes blister or sore is present at the time of labour and delivery, a caesarean section is usually done. A caesarean section may be recommended if a woman suspects she has symptoms of an impending outbreak, such as tingling or pain (prodromal symptoms). For women who have recurrent outbreaks, acyclovir used in the last 4 weeks of pregnancy may reduce the need for a caesarean section by reducing the risk of an outbreak at the time of delivery.
People with human immunodeficiency virus (HIV) should talk with their doctors for advice about these medicines. Depending on the stage of their illness, they may need higher doses or longer treatment time with antiviral medicines.
All medicines have side effects. But many people don't feel the side effects, or they are able to deal with them. Ask your pharmacist about the side effects of each medicine you take. Side effects are also listed in the information that comes with your medicine.
Here are some important things to think about:
Call 911 or other emergency services right away if you have:
Call your doctor right away if you have:
Common side effects of this medicine include:
See Drug Reference for a full list of side effects. (Drug Reference is not available in all systems.)
Medicine is one of the many tools your doctor has to treat a health problem. Taking medicine as your doctor suggests will improve your health and may prevent future problems. If you don't take your medicines properly, you may be putting your health (and perhaps your life) at risk.
There are many reasons why people have trouble taking their medicine. But in most cases, there is something you can do. For suggestions on how to work around common problems, see the topic Taking Medicines as Prescribed.
If you are pregnant, breast-feeding, or planning to get pregnant, do not use any medicines unless your doctor tells you to. Some medicines can harm your baby. This includes prescription and over-the-counter medicines, vitamins, herbs, and supplements. And make sure that all your doctors know that you are pregnant, breast-feeding, or planning to get pregnant.
Follow-up care is a key part of your treatment and safety. Be sure to make and go to all appointments, and call your doctor if you are having problems. It's also a good idea to know your test results and keep a list of the medicines you take.
- U.S. Department of Health and Human Services (2010). Genital HSV infections. Sexually Transmitted Diseases Treatment Guidelines 2010 (CDC Publication Vol. 59, No. RR-12), pp. 20–25. Atlanta: U.S. Department of Health and Human Services. Available online: http://www.cdc.gov/std/treatment/2010/STD-Treatment-2010-RR5912.pdf.
- Corey L, et al. (2004). Once-daily valacyclovir to reduce the risk of transmissioin of genital herpes. New England Journal of Medicine, 350(1): 11–20.
- Public Health Agency of Canada (2008, updated January 2010). Genital herpes simplex virus (HSV) infections. Canadian Guidelines on Sexually Transmitted Infections. Available online: http://www.phac-aspc.gc.ca/std-mts/sti-its/pdf/504genherp-vhs-eng.pdf.
- Infectious Diseases and Immunization Committee, Canadian Paediatric Society (2006, reaffirmed 2010). Current management of herpes simplex infection in pregnant women and their newborn infants. Paediatrics and Child Health, 11(6): 363–365. Also available online: http://www.cps.ca/english/statements/id/id06-03.htm.
Last Revised: March 15, 2012
This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information.