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Famvir ( Famciclovir )
FAMVIR?(famciclovir) is a prescription oral antiviral medication that is indicated for treatment of recurrent genital herpes, suppression of recurrent genital herpes, and treatment of recurrent herpes simplex virus infections (genital herpes and cold sores) in HIV-infected patients.
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Famvir
Types of Treatment
After the initial outbreak* of genital herpes, FAMVIR can be prescribed in one of three ways:
- Episodic treatment - your doctor treats an outbreak of genital herpes as it occurs. The usual dose of FAMVIR is one 125-mg pill, twice a day, for 5 days.�
- Suppressive treatment �if you have frequent or severe outbreaks, you take one 250-mg pill, twice a day, for up to 1 year†�to suppress the genital herpes virus and help to prevent outbreaks.
- Patients with HIV - FAMVIR is the only prescription oral antiviral therapy indicated for treating genital or orolabial herpes in people infected with HIV. In patients with herpes simplex and HIV, the dose of FAMVIR is 500 mg, twice a day, for 7 days.�
FAMVIR can be taken with or without food.
When discussing treatment options with your doctor, be sure to discuss your lifestyle, how you feel about outbreaks, the pain and severity of your symptoms, and the frequency of your outbreaks. Be sure to talk with your doctor about the type of treatment (episodic or suppressive) that would be most appropriate for you.
For episodic and suppressive treatment, always take your medicine as prescribed by your doctor. If you are taking any other prescription or over-the-counter medications, please be sure to tell your doctor. No medication has been proven to prevent the transmission of genital herpes. It's important to know that FAMVIR will not prevent the spread of genital herpes to others. During an outbreak, you must avoid sexual contact, and use a condom in between outbreaks.
Efficacy of FAMVIR
- Episodic Treatment
One clinical study showed that episodic treatment with FAMVIR significantly relieved all of the symptoms of a genital herpes outbreak. For many people, the duration of the symptoms associated with genital herpes, pain, burning, itching, and tenderness, was reduced. These same people also experienced a faster healing of sores compared to those taking a sugar pill.
- Suppressive Treatment
Many people on twice-daily suppressive therapy with FAMVIR may go almost a year without experiencing an outbreak.
Side Effects and Other Important Information
FAMVIR should not be taken by patients with known hypersensitivity to the product, its components, and DENAVIR® (penciclovir cream).
FAMVIR has no clinically significant interactions with cimetidine, allopurinol, theophylline, digoxin, or zidovudine (AZT).
Concurrent use of FAMVIR with probenecid or other drugs significantly eliminated by active renal tubular secretion may result in increased plasma concentrations of penciclovir.
FAMVIR does not contain any dyes.
FAMVIR (famciclovir) is not for everyone. In clinical studies with FAMVIR, the most commonly reported side effects included headache, nausea, and diarrhea. Ask your doctor if FAMVIR is right for you.�If you have kidney problems, your doctor will determine if FAMVIR is appropriate, and if so, what the right dose is for you. See the full Prescribing Information for more information about FAMVIR.
* The efficacy of FAMVIR has not been established for the treatment of an initial outbreak of genital herpes infection.
�If you have impaired kidney function, your doctor will determine the appropriate dose for you.
�The safety and efficacy of FAMVIR therapy beyond 1 year of treatment have not been established.
No antiviral has been proven to prevent the transmission of genital herpes.
There is no cure for genital herpes.
Common uses
This medicine is an antiviral used to treat herpes zoster (shingles) and genital herpes. It may also be used to treat other conditions as determined by your doctor.
Before using
INFORM YOUR DOCTOR OR PHARMACIST of all prescription and over-the-counter medicine that you are taking. Inform your doctor of any other medical conditions, allergies, pregnancy, or breast-feeding.
Directions
Follow the directions for using this medicine provided by your doctor. This medicine may be taken on an empty stomach or with food. TO CLEAR UP YOUR INFECTION COMPLETELY, continue taking this medicine for the full course of treatment, even if you feel better in a few days. Do not miss any doses. IF YOU MISS A DOSE OF THIS MEDICINE, take it as soon as possible. If it is almost time for your next dose, skip the missed dose and go back to your regular dosing schedule. Do NOT take 2 doses at once.
Cautions
If your symptoms do not improve within a few days or if they become worse, check with your doctor. BEFORE YOU BEGIN TAKING ANY NEW MEDICINE, either prescription or over-the-counter, check with your doctor or pharmacist. IT IS UNKNOWN IF THIS DRUG IS EXCRETED in breast milk. DO NOT BREAST-FEED while taking this medicine.
Possible side effects
SIDE EFFECTS, that may go away during treatment, include headache, nausea, vomiting, diarrhea, or tiredness. If they continue or are bothersome, check with your doctor. CONTACT YOUR DOCTOR IMMEDIATELY if you experience hallucinations, disorientation, or confusion. If you notice other effects not listed above, contact your doctor, nurse, or pharmacist.
Drug interactions
Drug interactions can result in unwanted side effects or prevent a medicine from doing its job. Use our drug interaction checker to find out if your medicines interact with each other.
If you take too much
If overdose is suspected, contact your local poison control center or emergency room immediately.
Additional information
DO NOT SHARE THIS MEDICINE with others for whom it was not prescribed. DO NOT USE THIS MEDICINE for other health conditions. KEEP THIS MEDICINE out of the reach of children. IF USING THIS MEDICINE FOR AN EXTENDED PERIOD OF TIME, obtain refills before your supply runs out.
For Professional:
FamvirÒ
(famciclovir) contains famciclovir, an orally administered prodrug
of the antiviral agent penciclovir. Chemically, famciclovir is
known as 2-[2-(2-amino-9H-purin-9-yl)ethyl]-1,3-propanediol
diacetate. Its molecular formula is C14H19N504
its molecular weight is 321.3. It is a synthetic acyclic guanine
derivative and has the following structure:
famciclovir
Famciclovir is a white to pale yellow solid.
It is freely soluble in acetone and methanol, and sparingly
soluble in ethanol and isopropanol. At 25° C famciclovir is
freely soluble (>25% w/v) in water initially, but rapidly
precipitates as the sparingly soluble (2%-3% w/v) monohydrate.
Famciclovir is not hygroscopic below 85% relative humidity.
Partition coefficients are: octanol/water (pH 4.8) P=1.09 and
octanol/phosphate buffer (pH 7.4) P=2.08.
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