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This antiviral medication effectively treats the symptoms of both genital herpes and cold sores, especially when you take it early on. It also can prevent new outbreaks.
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Written by Dr Yasmin Aghajan, MD
Information last reviewed 07/15/19
Famciclovir is an antiviral medication that works by inhibiting the DNA of viruses from replicating, so that the virus cannot multiply. It is used to treat the virus that causes cold sores, Herpes Simplex 1, or HSV-1, and the virus that usually causes genital herpes, HSV-2. HSV-1/HSV-2 first enters the body via the skin, mouth, or genitals, and migrates to the nerves. There, it can stay quiet, or “dormant” for a period of time before reactivating and causing symptoms. Symptoms of a genital herpes outbreak include pain, burning, tingling and itching between 6 hours to 4 days before the actual sore appears. This period is called the “prodrome” and treatment is most effective when started as soon as possible. The available treatments for genital herpes are Acyclovir, Valacyclovir, and Famciclovir. The benefit of Famciclovir is it has a shorter treatment duration.
Famciclovir works best when taken at the earliest sign of an outbreak. Although the medication will take effect immediately, you may not start to have relief until several hours or days after starting treatment. Treatment shortens the time it takes to heal and decreases the duration of viral shedding (contagious period).
The active ingredient in Famciclovir is the antiviral drug famciclovir (500mg)
Famciclovir contains the following inactive ingredients: hydroxypropyl cellulose, hydroxypropyl methylcellulose, lactose, magnesium stearate, polyethylene glycols, sodium starch glycolate and titanium dioxide.
The ingredients may vary by manufacturer; the ingredients listed above are the ingredients in Famvir.
Symptoms of a severe allergic reaction to this medication include facial swelling, hives, dizziness, itchy throat or difficulty breathing. While a severe allergic reaction to this medication is rare, if you do notice these symptoms shortly after taking the medication, please seek medical attention right away.
For the first episode of genital herpes, the treatment dosage is:
The dosage of Famciclovir to treat a recurrent episode of genital herpes (i.e., you have had genital herpes in the past and this is a recurrence) is:
The treatment works best when started at the first symptom and within 72 hours (ie. tingling, itching, burning, pain or an eruption).
The dosage of Famciclovir to treat cold sores (herpes labialis) is 1,500mg (3 x 500mg tablets) as a single dose. Treatment works best when started at the first symptom (ie. tingling, itching, burning, pain or an eruption around the lips).
Take the dosage and treatment length prescribed. Famciclovir does not have to be taken with food.
If taken in excessively high doses in patients with underlying kidney disease, Famciclovir can cause kidney failure.
Famciclovir is not a cure for herpes; you could still pass the virus onto others while being treated.
Let your doctor know if you have kidney disease, as the dose may have to be reduced based on your kidney function.
Let your doctor know if you have HIV or are immunocompromised.
The most common side effects of Famciclovir are headaches and nausea. A range of other side effects ahve been reported. It is important that you always read the patient information leaflet before taking any medication, including Famiciclovir.
There are very few drug interactions with Famciclovir. Some include: Cladribine, Talimogene Laherparepvec, Varicella virus vaccine, and Zoster vaccine (do not take this medication within 2 weeks of these vaccinations because it may make the vaccines less effective).
Famciclovir is contraindicated if you have an allergy to it or any of its ingredients. Famvir contains lactose; if you have a rare genetic problem of galactose intolerance or lactase deficiency, discuss this with your doctor.
Famciclovir (Famvir) is made by Novartis. A range of other manufacturers also make generic versions of Famiciclovir.
Famciclovir is used to treat cold sores (herpes labialis) as well as genital herpes infections, and herpes zoster (shingles).
Based on the available data, using Famiciclovir in pregnancy appears to be safe.
It is unknown if Famciclovir is present in breast milk. If herpes lesions are present on the breast, do not breastfeed until they are healed to avoid transmission to the infant.
Disclaimer: This is not medical advice. You and your physician will determine if and how you should take any medication prescribed to you following a medical consultation.
Herpes or Herpes Simplex Virus (HSV) is a viral infection with 2 forms: HSV-1 and HSV-2. These infections can result in oral cold sores, genital cold sores, or both. The World Health Organisation estimates that 3.7 billion people under 50 have HSV-1 globally, while 491 million people aged 15-49 have HSV-2. Herpes is one of the most common infections worldwide, with around 65% of people in the age range 15-49 infected with HSV-1 and 11% of people in the age range 15-49 infected with HSV-2.
HSV 2 or herpes simplex virus 2 is a viral infection. HSV can come in 2 forms: HSV-1 and HSV-2. The World Health Organisation estimates that 3.7 billion people under 50 have HSV-1 globally, while 491 million people aged 15-49 have HSV-2.
There are two main strands of the herpes simplex virus (HSV), type 1 and type 2. The first type is responsible for most oral herpes, which is more popularly known as cold sores. This virus is present in around 80% of people but often it’s dormant and only triggers cold sores when the immune system is weak. HSV type 2 is less common and only found in about 15% of the US population — although the share is gradually rising as people tend to become sexually active at younger ages.
The herpes simplex virus (HSV) is a very common virus that comes in two subcategories: HSV-1 and HSV-2. The first type, HSV-1, causes oral herpes — more commonly known as cold sores — and is carried by 70% to 80% of the US population. People often don’t even know, unless their immune system is weak enough for the virus to trigger a cold sores outbreak. The second herpes variety, HSV-2, is the primary culprit behind genital herpes. It occurs in about 15% of the sexually active population in the US but is mostly asymptomatic, which means there aren’t any visible lesions and blisters. There’s no gender difference; men and women are infected in equal proportions.
There are two types of herpes (herpes simplex virus): HSV-1 and HSV-2. Oral herpes around the mouth and on the lips usually is caused by HSV-1, but not exclusively so. Around 70-80% of the population have HSV-1 inside their bodies, but only about one third of those people will ever experience an oral herpes outbreak.
A herpes outbreak can be an unpleasant experience to deal with. Sadly, there is no cure or vaccine against the herpes simplex (HSV) or herpes zoster virus. But there are a few different medical treatment options from which you can choose.
Famciclovir is an antiviral prescription drug used in the treatment of infections caused by major types of herpes virus. A cure for herpes does not exist but antiviral medications can help patients to manage their symptoms more easily.
Infections caused by the herpes simplex virus (HSV) including genital herpes (HSV-2) and cold sores (HSV-1) and those caused by herpes zoster (shingles) are incredibly common.
Famciclovir (Famvir) is a prescription drug used to treat herpes infections caused by the herpes zoster virus (shingles) and herpes simplex virus (cold sores and genital herpes). It is prescribed to treat outbreaks and for long-term suppressive therapy of herpes.
Yes, taking antiviral medicines such as valacyclovir (Valtrex) during pregnancy is safe and does not appear to cause birth defects in the majority of patients.
Valtrex (also commonly known as valacyclovir) is an antiviral medication used to treat cold sores, genital herpes, shingles, and chickenpox. Valtrex is made by GlaxoSmithKline and is the brand name for valacyclovir. Generic Valtrex is widely available.
Valacyclovir (Valtrex, Zelitrex) is an antiviral drug used to treat viral infections caused by herpes simplex (cold sores, genital herpes), herpes zoster (shingles) and varicella zoster (chickenpox).
Valacyclovir (also known by the brand name Valtrex) has been available since 1995 and is commonly used to treat herpes simplex (oral and genital), herpes zoster (shingles) and chickenpox in children.
There is currently no cure available for genital herpes. Most people with genital herpes lead normal lives and manage to control symptoms by preventing herpes outbreaks and taking medications when necessary.
Genital herpes is caused by the herpes simplex virus type 2 (HSV 2). More recent studies have shown that type 1 (HSV 1) could also be causing genital herpes.
The herpes simplex virus 2 (HSV 2) is spread via genital contact and oral sex. Once infected, patients remain carriers for life. A large number of people who have HSV will never experience any symptoms whilst others may suffer frequent outbreaks and painful symptoms such as genital lesions.
No, you cannot get genital herpes by kissing someone who has it on the mouth. But if they have a cold sore, you could catch the oral herpes virus. However, you can catch genital herpes by kissing the genitals of someone who is affected.
Genital herpes is a common sexually transmitted disease (STD) that affects around 776,000 people in the U.S., according to the Centers for Disease Control and Prevention.
If you got chickenpox as a child, yes, there’s a chance of you developing herpes, but not the kind you’re thinking of. It’s one of the confusing things about the STI and the disease that cause shingles both being part of the same family. If you have chickenpox, the likelihood is that it will come back later in life in the form of shingles, unless you’re vaccinated. The likelihood of you developing herpes simplex is dependent on who you are, but so long as you have sex with people who don’t have herpes, you won’t get it either.
The primary way of contracting genital herpes is through unprotected sex with a person who has it, and presumably doesn’t have visible lesions. A condom can help to protect you against genital herpes and other STIs, but it’s important to realise that a condom may not cover all the sores, and therefore, you can still contract herpes from contact with uncovered areas.
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