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Famciclovir

Famciclovir 500MG

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What is Famciclovir?

Famciclovir is an antiviral drug that treats herpes infections. Famvir is the generic version. For a supply of 21 Famciclovir oral tablets 500 mg, the average cost is $196. However, you can use our free Rx.com coupon card to save significantly on Famciclovir prices at a participating pharmacy near you.

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What is Famciclovir ?

Famciclovir is an antiviral drug that treats herpes infections. Famvir is the generic version. For a supply of 21 Famciclovir oral tablets 500 mg, the average cost is $196. However, you can use our free Rx.com coupon card to save significantly on Famciclovir prices at a participating pharmacy near you.
  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing
  • Blistering, peeling, red skin rash
  • Decrease in how much or how often you urinate
  • Rapid weight gain, swelling of your face, ankles, or hands
  • Tiredness.
  • Tell your doctor if you are pregnant or breastfeeding, or if you have kidney disease, liver disease, or lactose absorption problems.
  • This medicine may make you dizzy or drowsy. Do not drive or do anything else that could be dangerous until you know how this medicine affects you.
  • Famciclovir will not stop the spread of herpes during sex. Avoid having sex while you have herpes sores.
  • Even if you have no signs of a herpes infection, it is still possible to spread the virus to others during sex. Talk with your doctor about ways to keep from spreading the virus.
  • Call your doctor if your symptoms do not improve or if they get worse.
  • Keep all medicine out of the reach of children. Never share your medicine with anyone.
What is famciclovir used to treat?
Famciclovir is FDA-approved to treat shingles (herpes zoster), recurrent cold sores (herpes labialis) in adults with healthy immune systems, and both the treatment and suppression of recurrent genital herpes in adults with healthy immune systems. It is also approved to treat recurrent orolabial or genital herpes in adults living with HIV.
How fast does famciclovir work for a cold sore or shingles?
Famciclovir works best when you start it as early as possible after symptoms appear, ideally at the first sign of tingling, pain, or a spot for a cold sore, or as soon as a shingles rash begins. Starting early gives the antiviral the best chance to shorten the outbreak and ease symptoms. Follow the exact dosing schedule your prescriber gives you.
What is the difference between famciclovir and valacyclovir (Valtrex)?
Both are oral antivirals used for herpes infections, but they convert into different active drugs in the body: famciclovir becomes penciclovir, while valacyclovir becomes acyclovir. They treat overlapping conditions, and the choice usually comes down to dosing convenience, kidney function, and cost. Both are available as generics, so comparing the price of your specific prescription is worthwhile.
What are the most common side effects of famciclovir?
The most commonly reported side effects are headache, nausea, diarrhea, fatigue, and dizziness. Less often, and mainly in older adults or people with reduced kidney function, neurologic effects such as confusion, drowsiness, or hallucinations have been reported. Talk to your provider if side effects bother you or do not go away.
Is famciclovir available as a generic and is it cheaper than Famvir?
Yes. Famciclovir is the generic form, and the brand Famvir has been discontinued in the U.S., so the generic is what pharmacies dispense. Generics are typically much less expensive than a brand would be. Because cash prices still vary by pharmacy, enter your ZIP above to see today's price and find a discount near you.
How much does Famciclovir cost without insurance?
The price of Famciclovir without insurance varies by pharmacy, dosage, and quantity. Rx.com compares cash prices at more than 60,000 US pharmacies so you can find the lowest price near you. Many people save up to 88% off retail prices with a free Rx.com coupon.
What are the common side effects of Famciclovir?
Common side effects of Famciclovir may include: Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing, Blistering, peeling, red skin rash, Decrease in how much or how often you urinate, Rapid weight gain, swelling of your face, ankles, or hands, Tiredness.. This is not a complete list — consult your pharmacist or doctor for full side effect information.
Is there a generic version of Famciclovir?
Generic versions may be available for Famciclovir. Generics contain the same active ingredients as brand-name drugs and are typically 80–90% cheaper. Search Famciclovir on Rx.com to compare generic and brand prices at pharmacies near you.
What is the cheapest pharmacy for Famciclovir?
The cheapest pharmacy for Famciclovir depends on your location and dosage. Rx.com compares prices at CVS, Walgreens, Walmart, Kroger, Costco, and thousands of independent pharmacies. Enter your ZIP code on Rx.com to find the lowest price for Famciclovir near you.

Famciclovir Coupons & Prices

Famciclovir 500MG

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Famciclovir Tablet — prescription drug image
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Looking for a famciclovir coupon? Famciclovir is a prescription antiviral used to treat shingles, cold sores, and genital herpes, and it is available as a low-cost generic (the brand Famvir has been discontinued in the U.S.). Even so, the cash price can vary widely from one pharmacy to the next, so it pays to compare before you fill. Rx.com checks prices across more than 60,000 pharmacies so you can find a discount near you. Enter your ZIP above to see today's price on famciclovir.

What is famciclovir and how does it work?

Famciclovir is an oral antiviral medicine in the guanosine nucleoside analog class. It is a prodrug of penciclovir, meaning the body converts it into its active form after you take it. Once active, it interferes with the herpes virus's ability to copy its own DNA, which helps slow the infection and speed healing. It does not cure herpes viruses, but it can shorten outbreaks and reduce how often they return.

Famciclovir is FDA-approved to treat acute herpes zoster (shingles); recurrent herpes labialis (cold sores) in immunocompetent adults; and both the treatment and suppression of recurrent genital herpes in immunocompetent adults. It is also approved to treat recurrent orolabial or genital herpes in adults living with HIV. Famciclovir works best when started as early as possible after symptoms begin.

Famciclovir cost without insurance and how to save

Famciclovir is a generic medicine, so it is already one of the more affordable antivirals in its class. The brand-name version, Famvir, has been discontinued in the U.S., which means the generic is what pharmacies dispense. Still, the cash price without insurance can differ a lot depending on which pharmacy you use, your dose, and how many tablets you need, so comparing prices genuinely matters.

With a free Rx.com discount, you may pay less than the standard cash price at the register, and no insurance is required. Because pharmacies set their own prices, the same prescription can cost noticeably more at one store than another nearby. Enter your ZIP above to see today's famciclovir price and find a participating pharmacy near you.

Famciclovir vs. valacyclovir and acyclovir

Famciclovir belongs to the same family of antivirals as two common alternatives. Your prescriber chooses among them based on your condition, dosing convenience, kidney function, and cost.

  • Valacyclovir (the generic of Valtrex) is a prodrug of acyclovir and is often prescribed with simple once- or twice-daily dosing for cold sores, shingles, and genital herpes.
  • Acyclovir is the original antiviral in this group and is usually the lowest-cost option, though it may require more frequent daily dosing.

All three are available as generics. Prices vary by pharmacy for each one, so it is worth comparing the specific drug and dose your provider prescribed. Enter your ZIP above to compare.

Famciclovir safety and side effects

Famciclovir has no boxed warning. The most common side effects include headache, nausea, diarrhea, fatigue, and dizziness. Some people, more often older adults or those with reduced kidney function, have reported neurologic effects such as confusion, drowsiness, or hallucinations. The dose must be adjusted for people with kidney impairment; acute kidney failure has occurred, especially in patients with underlying kidney disease or when the dose was not properly reduced.

Famciclovir tablets contain lactose, so use caution if you have galactose intolerance or Lapp lactase deficiency. Its safety in pregnancy has not been established, and caution is advised while breastfeeding. This is general information, not medical advice. Tell your provider about your kidney health, other medicines, and any pregnancy or nursing plans, and take famciclovir exactly as prescribed.

Sources & accuracy

This Famciclovir information was written and reviewed against authoritative U.S. medical sources — MedlinePlus (U.S. National Library of Medicine), DailyMed, and FDA prescribing information — and checked for accuracy. It is provided for education and is not a substitute for professional medical advice.

Verify the official label: Famciclovir on DailyMed (FDA)

Reviewed against FDA labeling · Last reviewed July 2026

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