This content has not been reviewed within the past year and may not represent Web MD's most up-to-date information. To find the most current information, please enter your topic of interest into our search box. 24, 2010 -- Taking certain antiviral medications for herpes infections during the first three months of pregnancy does not increase a child's risk of major birth defects, researchers report in this week's issue of the Journal of the American Medical Association. The antiviral drugs acyclovir, valacyclovir, and famciclovir are often prescribed to treat herpes viral infections, such as herpes simplex virus (HSV). More than one in five pregnant women have antibodies in their blood to HSV, indicating a past or present infection. Herpes antiviral medications are also used to treat herpes zoster infections, commonly known as shingles. Until now, information about the safety of these antivirals during pregnancy has been limited, according to background information in the journal article. The medications are listed as category B by the FDA. Valtrex is also taken to help prevent the spread of genital herpes to other adults. Valtrex is only a treatment for these health issues, not a cure. If you have genital herpes and plan to get pregnant, you should speak to your doctor. Genital herpes can be passed onto your baby in a condition called neonatal herpes. But if you are infected early in pregnancy or before becoming pregnant, chances are less than one percent that you will pass the virus to your baby. The active ingredient in Valtrex is valacyclovir hydrochloride (acyclovir). This ingredient has not been extensively studied for use in pregnant women. A registry was started in 1984 and completed in 1999 for use in pregnant women. The occurrence of birth defects approximated that of the general population. Prednisone med Prednisone dosage for dogs Background The antiviral agents acyclovir Zovirax, valacyclovir. herpes simplex virus infection during the first trimester of pregnancy, and. Indications and Usage For ValtrexValtrex Dosage and AdministrationContraindicationsWarnings and PrecautionsAdverse ReactionsDrug InteractionsUse in Specific PopulationsOverdosageValtrex DescriptionNonclinical ToxicologyClinical StudiesHow Supplied/Storage and HandlingPatient Counseling Information Valtrex and pregnancy may not be a good combination for a developing fetus. Read on to find out more about this common herpes drug. Information on Valtrex and Pregnancy. Valtrex is a prescription medication taken to lower the ability of herpes viruses to increase in the body. Valtrex is taken to treat the following symptoms I tend to break out in cold sores when I am anxious or stressed out and Valtrex seems to be the only thing that works for me. Could I take it during the last few weeks of pregnancy to ensure I don't have cold sores when my baby arrives? You should continue to take your daily maintenance dose as normal to prevent an outbreak, because of obvious reasons, such as uncomfortableness and such. however if you don't take it for maintenance it won't hurt either. However you should and must start on it at 34 weeks, so to insure that you don't have an outbreak, If during your labor you have an outbreak or open sores, and if you have vaginal birth, you put your baby at risk. So most doc's will want to do a c-section to prevent that risk, but the maintenance dose after 34 weeks helps keep that from happening,. There are no reported affects of harmful sideaffects to the baby. It is very embarrasing to talk with my doctor about it but I had to know if I should keep taking valtrex or not and he said to keep taking it because it will do the baby more harm if I do not take it . I have type 1 and i am currently 37 weeks pregnant and on valtrex since 36 weeks so I'm assuming its fine. I get cold sores in and around my mouth and have been prescribed valtrex and a friend of mine said they thought valtrex was one of the drugs that could give you a false negative pregnancy test. Everyone tells me not to worry, but I just can't help thinking I may have done something wrong. I tried researching online and already let ob/gyn know plus have appt w ophthalmologist tomorrow, but there doesn't seem to be much info on shingles in pregnancy, anyone else ever have this problem? I am not sure if the acyclovir crosses the placenta into the baby. I am wondering if anyone knows if taking acyclovir during your first trimester or anytime in your pregnancy can cause your baby to have any birth defects or problems. Has anyone taken valtrex or acyclovir during there first trimester? The medicines are considered very safe in pregnancy, and the protocol is that women with HSV 2 infection, with or without symptoms, get suppressed, not just women with symptoms. If I were you and your wife, I would insist on daily therapy because everything you have read says you can shed the virus without symptoms and you want the most protection possible. The anti-herpes drugs are totally safe late in pregnancy, for both baby and mom. Valtrex in pregnancy Use of acyclovir, valacyclovir, and famciclovir in the., Valtrex - FDA prescribing information, side effects Viagra mayo clinicMetoprolol brandsKamagra poloWhere to buy viagra online in usa Pregnancy registry data reported 1 document exposures to this drug or any formulation of its active metabolite, respectively, of which 29 and 756 exposures occurred in the first trimester. Valacyclovir Valtrex Use During Pregnancy -. Important Facts About Using Valtrex During. Herpes Drugs May Be Safe in Early Pregnancy -. Long-term suppressive therapy can significantly reduce these outbreaks and is likely safe during pregnancy. Acyclovir Zovirax and valacyclovir Valtrex are the drugs most commonly used for herpes outbreak suppression and treatment during pregnancy. These drugs help reduce how active the virus is. However, elderly patients are more likely to have age-related kidney disease, which may require an adjustment in the dose of patients receiving valacyclovir. Pregnancy Information about this valacyclovir-oral-route Acyclovir Zovirax and valacyclovir Valtrex are the drugs most commonly used for herpes outbreak suppression and treatment during pregnancy. These drugs help reduce how active the virus is.