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Famvir is an antiviral medication that is used to treat herpes zoster (shingles) and genital herpes. It works by stopping the growth of the virus. This medication does not cure these infections, but it can lessen the symptoms and shorten the duration of the outbreak.

  • Delivery time: Airmail (14-21 days) | EMS trackable (5-9 days)
  • Prescription: Included
  • Availability: In Stock

Famvir Information

Famvir Medication Information Leaflet

Common Use

Famvir is commonly used to treat herpes zoster (shingles) and genital herpes.

Generic Ingredient

The generic ingredient for Famvir is famciclovir.


Famvir is classified as an antiviral medication.

Clinical Use

It is used for the treatment of herpes zoster and recurrent episodes of genital herpes in immunocompetent adults.

Spectrum Of Activity

Famvir exhibits activity against herpes zoster and herpes simplex virus (HSV) types 1 and 2.

Drug interaction

Famvir may interact with probenecid, nephrotoxic agents, and mycophenolate mofetil. Consult a healthcare professional for personalized advice and potential drug interactions.

Dosage and Directions

The typical dosage of Famvir for the treatment of herpes zoster is 500 mg every 8 hours for 7 days. For recurrent episodes of genital herpes, the recommended dosage is 125 mg twice daily for 5 days.

Contraindications and Precautions

Famvir is contraindicated in patients with known hypersensitivity to famciclovir. Precautions should be taken in patients with renal impairment. Consult a healthcare professional for personalized advice.

Possible side effect

Common side effects of Famvir may include headache, nausea, and diarrhea.

Missed dose and Overdose

If a dose of Famvir is missed, it should be taken as soon as possible. In case of an overdose, seek medical attention immediately.

Special Cases

Special monitoring is recommended in elderly patients and those with renal impairment when using Famvir.

Known Non-standard Use

Famvir may be used off-label for the treatment of other viral infections. Consult a healthcare professional for personalized advice.

Patient Considerations

Patients should be advised to maintain adequate hydration during treatment with Famvir.

Possible Risks

There may be a risk of developing resistance to famciclovir with prolonged use. Consult a healthcare professional for personalized advice.

Breastfeeding and Pregnancy

Famvir should be used during pregnancy only if the potential benefits justify the potential risks to the fetus. It is advised to avoid breastfeeding while using Famvir due to the potential risk to the infant.

Known Alternatives

Alternatives to Famvir for the treatment of herpes zoster and genital herpes may include acyclovir and valacyclovir.


Famvir should be stored at room temperature, away from moisture and heat.

Famvir FAQ

What is Famvir used for?

Famvir is used to treat infections caused by certain types of viruses, including herpes viruses. It can be used to treat herpes zoster (shingles) and genital herpes.

How does Famvir work?

Famvir works by stopping the virus from replicating and spreading in the body. It does this by blocking the action of an enzyme that the virus needs to multiply.

How should I take Famvir?

Famvir should be taken exactly as prescribed by your healthcare provider. It is typically taken orally with or without food. It is important to finish the full course of medication, even if you start to feel better.

What are the possible side effects of Famvir?

Some common side effects of Famvir may include headache, nausea, diarrhea, and fatigue. If any of these side effects persist or worsen, it is important to consult with your doctor.

Can I take Famvir during pregnancy or while breastfeeding?

It is important to consult with your doctor before taking Famvir during pregnancy or while breastfeeding, as the potential risks need to be weighed against the benefits.

What should I do if I miss a dose of Famvir?

If you miss a dose of Famvir, take it as soon as you remember. However, if it is almost time for your next dose, skip the missed dose and continue with your regular dosing schedule.

Is it safe to drive or operate machinery while taking Famvir?

Famvir may cause dizziness or drowsiness in some individuals. If you experience these effects, it is advisable to avoid driving or operating machinery until you know how Famvir affects you.

How long does it take for Famvir to start working?

The time it takes for Famvir to start working may vary depending on the condition being treated. It is important to follow the prescribed treatment duration and consult with your doctor if you have any concerns about the medication's effectiveness.

Can I drink alcohol while taking Famvir?

It is advisable to avoid or limit alcohol consumption while taking Famvir, as alcohol may interact with the medication and increase the risk of certain side effects.

Are there any specific food or drinks to avoid while taking Famvir?

There are no specific foods or drinks that need to be avoided while taking Famvir. However, it is important to maintain a balanced diet and stay well-hydrated during the course of treatment.

Can Famvir be used to prevent herpes outbreaks?

Famvir may be prescribed to prevent recurring herpes outbreaks in certain individuals. It is essential to follow the prescribed dosage and consult with your doctor for personalized recommendations.

What should I tell my healthcare provider before taking Famvir?

Before taking Famvir, it is important to inform your healthcare provider about any pre-existing medical conditions, ongoing medications, and any history of allergies, especially related to antiviral medications.

Does Famvir cure herpes?

Famvir does not cure herpes, but it can help to reduce the severity and duration of herpes outbreaks. It is important to follow the prescribed treatment plan and consult with your doctor for comprehensive management of the condition.

What precautions should I take while using Famvir?

While using Famvir, it is important to practice safe hygiene, avoid close physical contact during outbreaks, and use protection during sexual activity to prevent the spread of herpes.

Is Famvir addictive?

Famvir is not known to be addictive, as it does not cause a physical dependence. However, it is crucial to use the medication only as prescribed by your doctor.

Famvir Properties

  • Clinical use: Antiviral therapy
  • Spectrum of activity: Herpes simplex virus
  • Mechanism of action: Phosphorylated by viral kinase to a triphosphate form that inhibits viral DNA polymerase
  • Classification: Nucleoside analog
  • Recommended Dosage: 250-500 mg orally twice daily for 7-10 days for shingles; varies for other conditions
  • Basic Side Effects: Headache, Nausea, Diarrhea
  • Serious Side Effects: Thrombocytopenia, Palpitations, Dyspnea

Famvir Drug Class

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