Famvir from Meds Today

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Famvir

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Medication Information

Famvir is used to treat herpes zoster (shingles) and genital herpes. It does not cure herpes infections but decreases pain and itching, helps sores to heal, and prevents new ones from forming.
Famvir is sometimes prescribed for other uses; ask your doctor or pharmacist for more information.

How should this medicine be used?

Famvir comes as a tablet to take by mouth. It is usually taken every 8 hours (three times a day) for 7 days to treat shingles. To treat genital herpes it is usually taken twice a day for 5 days. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take Famvir exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor. Use Famvir as soon as possible after symptoms appear.

Continue to take Famvir even if you feel well. Do not stop taking Famvir without talking to your doctor.

What special precautions should I follow?

Before taking Famvir,

tell your doctor and pharmacist if you are allergic to Famvir, acyclovir (Zovirax), or any other drugs. tell your doctor and pharmacist what prescription and nonprescription medications you are taking, especially digoxin (Lanoxin), probenecid (Benemid), and vitamins.
tell your doctor if you have or have ever had kidney or liver disease, problems with your immune system, human immunodeficiency virus infection (HIV), or acquired immunodeficiency syndrome (AIDS).
tell your doctor if you are pregnant, plan to become pregnant, or are breast-feeding. If you become pregnant while taking Famvir, call your doctor.

What special dietary instructions should I follow?

Famvir may cause an upset stomach. Take Famvir with food or milk.

What should I do if I forget a dose?

Take the missed dose as soon as you remember it, and take any remaining doses for that day at evenly spaced intervals. However, if it is almost time for the next dose, skip the missed dose and continue your regular dosing schedule. Do not take a double dose to make up for a missed one.

What side effects can Famvir cause?

Although side effects from Famvir are not common, they can occur. Tell your doctor if any of these symptoms are severe or do not go away:

headache
upset stomach
vomiting
diarrhea or loose stools
If you experience any of the following side effects, call your doctor immediately:

rash
itching

What storage conditions are needed for this medicine?

Keep Famvir in the container it came in, tightly closed, and out of reach of children. Store it at room temperature and away from excess heat and moisture (not in the bathroom). Throw away any medication that is outdated or no longer needed. Talk to your pharmacist about the proper disposal of your medication.

In case of emergency/overdose

In case of overdose, call your local poison control center at 1-800-222-1222. If the victim has collapsed or is not breathing, call local emergency services at 911.

What other information should I know?

Keep all appointments with your doctor and the laboratory. Your doctor will order certain lab tests to check your response to Famvir.

Do not have sexual intercourse when you can see the genital herpes lesions. However, genital herpes can be spread even when there are no symptoms.

Do not let anyone else take your medication. Ask your pharmacist any questions you have about refilling your prescription. If you still have symptoms of infection after you finish the Famvir, call your doctor.