Famvir (Famcyclovir)

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Famvir Brand
Dosage Quantity & Price
Famcyclovir (Generic alternate to Famvir) Generic
Dosage Quantity & Price
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Table of contents:

Famvir, scientifically known as famciclovir is an antiviral medication used to treat infections caused by certain types of viruses, primarily herpes viruses. Famcyclovir works by slowing the growth and spread of the herpes virus, allowing the body's natural defenses to fight off the infection.

Famciclovir can be used to treat shingles (herpes zoster), outbreaks of genital herpes, and cold sores caused by herpes simplex virus. It is available in tablet form and requires a prescription from a healthcare provider.

Uses and Dosage

Famvir (famciclovir) tablets should be taken orally as prescribed by your physician. The usual prescription is to take it twice or thrice daily, with or without a meal. Swallow the tablet with a glass of water. To ensure effectiveness, take Famvir regularly and at equal intervals to maintain a constant level of the drug in the body.

Create a dosing schedule to avoid missing any doses. Any adjustment to your dosage should be determined by your physician based on your medical condition, age, and response to treatment. Do not discontinue taking this medication suddenly, as it may worsen your condition.

The typical dosing for Famciclovir is as follows:

  • For cold sores, the typical dose is 1500mg taken orally in a single dosage; for genital herpes, the typical dose is 1 gram taken orally twice daily for one day, and for suppressive therapy, the dosage is 250 mg taken orally twice daily.
  • For cold sores or genital herpes in adults with HIV, the typical dosage is 500mg taken orally twice daily for 7 days.
  • For shingles, the typical dosage is 500mg taken orally every 8 hours (3 times daily) for 7 days. Your dosage may be different if you have kidney problems, ask your healthcare provider to determine the right dosage for you.

Side effect

Common Side Effects of Famvir (Famcyclovir):

  • Diarrhea or loose stools
  • Gas
  • Headache
  • Itching
  • Nausea
  • Painful menstrual periods
  • Rash
  • Stomach pain
  • Tiredness
  • Vomiting

Serious Side Effects of Famvir (Famcyclovir):

  • Bloated, full feeling
  • Burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feeling
  • Confusion as to time, place, or person
  • Excess air or gas in the stomach or intestines
  • Hives or welts
  • Holding false beliefs that cannot be changed by fact
  • Itching skin
  • Mood or mental changes
  • Passing gas
  • Redness of skin
  • Seeing, hearing, or feeling things that are not there
  • Unusual excitement, nervousness, or restlessness
  • Unusual tiredness or weakness
  • Vomiting

Form and Strength

Famvir (Famcyclovir) is available in the following forms and strength:

Famvir: Tablet

  • 125 mg
  • 250 mg
  • 500 mg

Famcyclovir: Tablet

  • 125 mg
  • 250 mg
  • 500 mg


  • Tell your doctor if you have any allergies or medical conditions, especially kidney problems.
  • Famvir may interact with other medications, tell your doctor about all the medications you are taking, including over-the-counter drugs and herbs and supplements.
  • The use of Famvir during pregnancy is not recommended unless the potential benefits outweigh the risks. Breastfeeding while taking Famvir is also not recommended.
  • Famvir may cause side effects such as nausea, vomiting, diarrhea, and headache. If these side effects persist or worsen, you should contact your doctor.
  • Some people may experience allergic reactions to Famvir, including rash, itching, swelling, dizziness, and trouble breathing. Seek immediate medical attention if you experience any signs of an allergic reaction.
  • Famvir may cause dizziness or drowsiness, avoid driving or operating machinery until you know how it affects you.
  • The safety and efficacy of Famvir in children under the age of 18 has not been established.
  • Famvir should be used with caution in elderly patients, as they may be more sensitive to the effects of the medication.
  • Famvir may reduce the effectiveness of some hormonal contraceptives, use an additional form of contraception if you are taking Famvir and using hormonal contraceptives.

Frequently Asked Questions (FAQ)

How long does it take for famciclovir to work for cold sores?

In clinical trials, the average time for cold sores to improve with famciclovir treatment was 4 days.

How often can you take famciclovir?

Famciclovir can be taken when you have a herpes outbreak or flare. Talk to your provider if you think you are having too many outbreaks; they may recommend a lower dose that you can take every day to prevent outbreaks.

Can Famvir be used during pregnancy or while breastfeeding?

The use of Famvir during pregnancy is not recommended unless the potential benefits outweigh the risks. Breastfeeding while taking Famvir is also not recommended.


It's important to purchase Famvir from verified Canadian pharmacy.

Additional information

Generic name:

Famciclovir, Famcyclovir




125mg, 250mg, 500mg

Quantities Available:

10, 21, 30, 90