Valacyclovir is an antiviral drug. It slows the growth and spread of the herpes virus so that the body can fight off the infection. Valacyclovir lessens the symptoms of these infections and shortens the length of time you are sick.
Valacyclovir is used in the treatment and suppression of genital herpes, shingles, and cold sores. Valacyclovir is not a cure for herpes virus infections.
Valacyclovir may also be used for purposes other than those listed in this medication guide.
How should I take Valtrex (Valacyclovir)?
Take valacyclovir exactly as directed by your doctor. If you do not understand these directions, ask your pharmacist, nurse, or doctor to explain them to you.
Treatment with valacyclovir should be started as soon as possible after the first appearance of symptoms (e.g. for cold sores-tingling, burning, blisters).
Take each dose with a full glass of water.
Valacyclovir can be taken with or without food. Taking valacyclovir with food may decrease stomach upset.
Take all of the valacyclovir that has been prescribed for you even if you begin to feel better. Your symptoms may start to improve before the infection is completely treated.
It is important to take valacyclovir regularly to get the most benefit.
Lesions caused by herpes viruses should be kept as clean and dry as possible. Wearing loose clothing may help to prevent irritation of the lesions.
Store valacyclovir at room temperature away from moisture and heat.
What are the possible side effects of Valtrex (Valacyclovir)?
Stop taking valacyclovir and seek emergency medical attention if you experience an allergic reaction (difficulty breathing; closing of the throat; swelling of the lips, tongue, or face; or hives).
Other, less serious side effects may be more likely to occur. Continue to take valacyclovir and talk to your doctor if you experience
- nausea, vomiting, diarrhea, constipation, or abdominal pain
- headache
- dizziness; or
- tremors
Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome.
What other drugs affect Valtrex (Valacyclovir)?
Probenecid (Benemid) and cimetidine (Tagamet, Tagamet HB) may increase the effects of valacyclovir and possibly lead to dangerous side effects. You may need a dosage adjustment or special monitoring during treatment if you are taking probenecid or cimetidine.
Drugs other than those listed here may also interact with valacyclovir. Talk to your doctor and pharmacist before taking any prescription or over-the-counter medicines, including vitamins, minerals, and herbal products.
What should I avoid while taking Valtrex (Valacyclovir)?
Herpes infections are contagious and you can infect other people, even during treatment. Avoid letting infected areas come into contact with other people. Wash your hands frequently to prevent transmission.
Valacyclovir will not prevent the spread of genital herpes. Avoidance of sexual intercourse and use of latex condoms may prevent spreading the virus to others.
What happens if I overdose on Valtrex (Valacyclovir)?
Seek emergency medical treatment if an overdose is suspected.
The symptoms of an overdose of valacyclovir are not well known, but an overdose of acyclovir (Zovirax), which is a similar drug, may cause seizures, hallucinations, and kidney damage (decreased urine production).
What happens if I miss a dose of Valtrex (Valacyclovir)?
Take the missed dose as soon as you remember. However, if it is almost time for the next regularly scheduled dose, skip the missed dose and take the next one as directed. Do not take a double dose of this medication unless otherwise directed by your doctor.
What is the most important information I should know about Valtrex (Valacyclovir)?
Take all of the valacyclovir that has been prescribed for you even if you begin to feel better. Your symptoms may start to improve before the infection is completely treated.
Treatment with valacyclovir should be started as soon as possible after the first appearance of symptoms (e.g. tingling, burning, blisters).
Herpes infections are contagious and you can infect other people, even during treatment. Avoid letting infected areas come into contact with other people. Wash your hands frequently to prevent transmission.
Valacyclovir is not a cure for herpes virus infections.
What should I discuss with my healthcare provider before taking Valtrex (Valacyclovir)?
Do not take valacyclovir without first talking to your doctor if you are allergic to acyclovir (Zovirax).
Before taking this medication, tell your doctor if you have kidney disease or immune system problems. You may need a dosage adjustment or special monitoring during treatment with valacyclovir.
Valacyclovir is in the FDA pregnancy category B. This means that it is not expected to be harmful to an unborn baby. Do not take this medication without first talking to your doctor if you are pregnant or could become pregnant during treatment.
It is not known whether valacyclovir passes into breast milk and how it may affect a nursing baby. Do not take this medication without first talking to your doctor if you are breast-feeding a baby.
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