osudhkosh

Generic

Famciclovir INN

3 brands available in the market

At a glance

Famciclovir INN is an antiviral medication used for the treatment of herpes labialis, herpes simplex virus infections, shingles, and genital herpes infection.

Description

Famciclovir INN is an antiviral medicine. It helps in treating viral infections like herpes labialis, herpes simplex virus infections, shingles, and genital herpes infection. It prevents the multiplication of virus in human cells and therefore helps in clearing the infection.

Famciclovir INN should be taken in the dose and duration as advised by your doctor. Do not skip any doses and finish the full course of treatment even if you feel better. It may be taken with or without food, but it is better to take it at a fixed time.

Indications
  • Herpes Labialis: Used for treatment of cold sores on lips.
  • Herpes Simplex Virus Infections: Used for treatment of HSV infections.
  • Shingles (Herpes Zoster): Used for treatment of shingles.
  • Genital Herpes Infection: Used for treatment of genital herpes.
Therapeutic class

Antiviral drugs

Pharmacological class

Nucleoside Analogue (Antiherpetic)

Pharmacology

Famciclovir INN is an antiviral medication. It prevents the multiplication of virus in human cells. This stops the virus from producing new viruses and clears up your infection.

Mechanism of action

Famciclovir INN is an antiviral medication. It prevents the multiplication of virus in human cells and helps clear the infection.

Dosage

Adult Dose:

  • Herpes Zoster (Shingles): 500 mg tid x 7 days.
  • Genital Herpes (First Episode): 250 mg tid x 5 days.
  • Genital Herpes (Recurrent): 125 mg bid x 5 days.
  • Herpes Labialis: 1500 mg single dose OR 750 mg bid x 1 day.

Renal Dose: Dose adjustment may be needed based on CrCl.

Administration

Take this medicine in the dose and duration as advised by your doctor. Swallow it as a whole. Do not chew, crush or break it. Famciclovir INN may be taken with or without food, but it is better to take it at a fixed time.

Missed dose

If you miss a dose of Famciclovir INN, take it as soon as possible. However, if it is almost time for your next dose, skip the missed dose and go back to your regular schedule. Do not double the dose.

Side effects

Common Side Effects:

  • Headache
  • Dizziness
  • Vomiting
  • Nausea
  • Fatigue
  • Fever
  • Stomach pain
  • Diarrhea
  • Skin rash
Precautions & warnings

Precautions:

  • Famciclovir INN may decrease alertness, affect vision or make you feel sleepy and dizzy; do not drive if these symptoms occur.
  • Drink plenty of water during treatment to prevent dehydration and kidney damage.
  • Inform doctor if pregnant, planning to conceive or breastfeeding.
  • Use with caution in kidney disease; dose adjustment may be needed.
  • Use with caution in severe liver disease; dose adjustment may be needed.
Contraindications

Contraindications: Hypersensitivity.

Drug interactions

Drug Interactions: No significant interactions known.

Food interactions

Food Interactions: It is not known whether it is safe to consume alcohol with Famciclovir INN; consult your doctor.

Use in pregnancy

Use in Pregnancy: Famciclovir INN is generally considered safe during pregnancy; animal studies have shown low or no adverse effects.

Pregnancy Category: B — always consult a doctor before taking during pregnancy.

Use in lactation

Use in Lactation: Famciclovir INN is probably unsafe during breastfeeding; limited data suggests drug may pass into breastmilk and harm the baby.

Pediatric use

Pediatric Use: Safety and efficacy not established.

Geriatric use

Geriatric Use: No specific dosage adjustment is necessary for elderly patients.

Renal / hepatic impairment

Renal Impairment: Use with caution; dose adjustment may be needed.

Hepatic Impairment: Use with caution; severe liver disease: dose adjustment may be needed; mild-moderate: no adjustment needed.

Overdose effects

Overdose: Limited information on overdose; symptomatic treatment.

Storage conditions

Storage: Store in a cool and dry place, protected from light. Keep out of reach of children.

Chemical structure

Famciclovir INN

Common questions

Q1: How to treat herpes?
Herpes simplex and herpes zoster are different and have different dosage; correct diagnosis is required.
Q2: What medicine for cold sores on lips?
This is herpes labialis; visit for proper treatment; meanwhile apply Acivir gel twice a day.
Q3: Is Valcivir 500 mg useful in herpes?
Yes, valcivir is useful in herpes; herpes is a viral infection of skin presents with blisters.
Q4: Cold sores on lips every March, what is the cure?
Share your treatment details.
⚠️ This information is for educational purposes only — not a substitute for medical advice. Consult a registered physician before taking any medicine.