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Indications

Famvir is a medication that contains the active substance famciclovir, which belongs to the family of antiviral drugs.

Famvir is mainly used for the treatment of herpes virus infections, including herpes genitalis, herpes zoster (shingles), and cold sores caused by herpes labialis.

Famvir works by stopping the spread of the herpes virus, reducing the severity and duration of symptoms, and preventing the virus from multiplying in the body.

However, it is not a cure for herpes infections and the viruses that cause these infections continue to live in the body even after treatment with Famvir.

Use and Dosage

Read the Patient Information Leaflet if available from your pharmacist before you start taking famciclovir each time you get a refill. If you have any questions, ask your doctor or pharmacist.

Take this medication by mouth with or without food as directed by your doctor, usually 2 to 3 times a day.

This medication works best when started at the first sign of an outbreak, as directed by your doctor. It may not work as well if you delay treatment.

The dosage is based on your medical condition and response to treatment.

This medication works best when the amount of drug in your body is kept at a constant level. Take this drug at evenly spaced intervals. To help you remember, take it at the same time each day.

Continue to take this medication until the full prescribed amount is finished. Do not change your dose, skip any doses, or stop this medication early without your doctor’s approval.

Tell your doctor if your condition lasts or gets worse.

Side Effects

Common side effects include:

• Nausea
• Headache
• Dizziness
• Sleepiness
• Tired feeling
• Stomach pain
• Diarrhea
• Gas

The side effects brought about by this prescription medication are mild and will resolve after a few days. If the adverse reactions get worse or do not get better, you may have to hold the drug for a while and talk to your doctor or any healthcare professional.

Severe side effects include:

• Easy bruising or bleeding
• Mental or mood change, such as confusion, hallucination, or slowed thinking
• Yellowish eyes or skin
• Severe drowsiness
• Signs of kidney problems (pain in the lower back, changes in urine output)

This is not a complete list of the side effects of Famvir.

Cautions

Before taking famciclovir, tell your doctor or pharmacist if you are allergic to it; or to penciclovir; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of: kidney problems.

This drug may rarely make you dizzy or drowsy. Alcohol or marijuana (cannabis) can make you more dizzy or drowsy. Do not drive, use machinery, or do anything that needs alertness until you can do it safely. Limit alcoholic beverages.

Talk to your doctor if you are using marijuana (cannabis).

This medication may contain lactose. If you have certain conditions such as galactose intolerance, severe lactase deficiency (not lactose or milk intolerance), or glucose-galactose malabsorption that require you to restrict your intake of lactose, consult your doctor or pharmacist before taking this medication.

Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

Do not have certain immunizations/vaccinations (such as vaccines against the varicella virus) without the consent of your doctor.

Older adults may be more sensitive to the side effects of this drug, especially dizziness, drowsiness, confusion, and change in the amount of urine (kidney problems).

Famciclovir does not protect against the spread of genital herpes. To lower the chance of giving herpes to your partner, do not have sexual contact during an outbreak or if you have symptoms. You can spread genital herpes even if you do not have symptoms. Always use an effective barrier method (latex or polyurethane condoms/dental dams) during all sexual activity. Consult your doctor or pharmacist for more details.

During pregnancy, this medication should be used only when needed. Discuss the risks and benefits with your doctor.

It is unknown if this medication passes into breast milk. It may have undesirable effects on a nursing infant.

Consult your doctor before breastfeeding.

Form and Strengths

Famvir is available in the following form and strengths:

• Famvir Tablet:
  • 125 mg
  • 250 mg
  • 500 mg
• Famcyclovir Tablet:
  • 125 mg
  • 250 mg
  • 500 mg

FAQ

Is this medication an antibiotic?

This oral medication is an antibiotic used to treat infections caused by viruses, such as herpes viruses.

Can I use Famvir for shingles?

Yes, this is an effective medication to treat shingles or herpes zoster.

Does this medication cause stomach upset?

This medication may cause stomach pain. If it happens, take this drug with a meal.

Resources:

1. https://www.webmd.com/drugs/2/drug-4085/famvir-oral/details
2. https://www.drugs.com/famvir.html
3. https://www.accessdata.fda.gov/drugsatfda_docs/label/2011/020363s037lbl.pdf