FAMCICLOVIR (Systemic)

Some commonly used brand names are:

In the U.S.?

• Famvir

In Canada?

• Famvir

Category

• Antiviral, systemic

Description

Famciclovir (fam-SYE-kloe-veer) is used to treatthe symptoms of herpes zoster (also known as shingles), a herpes virus infectionof the skin. It is used to treat and suppress recurrent episodes of genitalherpes infection. This medicine is also used to treat recurrent herpes virusinfections of the mucous membranes (lips and mouth) and genitals in HIV-infectedpatients. Although famciclovir will not cure genital herpes or herpes zoster,it does help relieve the pain and discomfort and helps the sores heal faster.

Famciclovir is available only with your doctor's prescription, in the followingdosage form:

Oral
• Tablets (U.S. and Canada)

Before Using This Medicine

In deciding to use a medicine,the risks of taking the medicine must be weighed against the good it willdo. This is a decision you and your doctor will make. For famciclovir, thefollowing should be considered:

Allergies?Tell your doctor if you have ever had any unusual orallergic reaction to famciclovir. Also tell your health care professionalif you are allergic to any other substances, such as foods, sulfites or otherpreservatives, or dyes.

Pregnancy?Famciclovir has not been studied in pregnant women.However, famciclovir has not been shown to cause birth defects or other problemsin animal studies.

Breast-feeding?It is not known whether famciclovir passes intothe breast milk of humans; however, it does pass into the milk of rats. Famcicloviris not recommended during breast-feeding because it may cause unwanted effectsin nursing babies.

Children?Studies on this medicine have been done only in adultpatients, and there is no specific information comparing use of famciclovirin children with use in other age groups.

Older adults?Famciclovir has been used in the elderly and hasnot been shown to cause different side effects or problems in older peoplethan it does in younger adults.

Other medicines?Although certain medicines should not be usedtogether at all, in other cases two different medicines may be used togethereven if an interaction might occur. In these cases, your doctor may want tochange your dose or other precautions may be necessary. Tell your health careprofessional if you are taking any other prescription or nonprescription(over-the-counter [OTC]) medicine.

Other medical problems?The presence of other medicalproblems may affect the use of famciclovir. Make sure you tell your doctorif you have any other medical problems, especially:

• Kidney disease?Kidney disease may increase blood levels ofthis medicine, increasing the chance of side effects

Proper Use of This Medicine

Famcicloviris best used within 48 hours after the symptoms of shingles (for example,pain, burning, blisters) begin to appear, or within 6 hours after the symptomsof recurrent genital herpes (for example, pain, blisters) begin to appear.

Famciclovir may be taken with meals.

To help clear up your herpes infection, keep takingfamciclovir for the full time of treatment, even if your symptoms beginto clear up after a few days. Do not miss any doses.However, do not use this medicine more often or for alonger time than your doctor ordered.

Dosing?The dose of famciclovir will be different fordifferent patients. Follow your doctor's orders or thedirections on the label. The following information includes only theaverage doses of famciclovir. Your dose may be different if you have kidneydisease. If your dose is different, do not change it unless your doctor tells you to do so.

• For oral dosage form (tablets):
  • For treatment of shingles:
    • Adults?500 milligrams (mg) every eight hours for seven days.
    • Children?Use and dose must be determined by your doctor.
  • For suppression of recurrent genital herpes:
    • Adults?250 mg two times a day for up to one year.
    • Children?Use and dose must be determined by your doctor.
  • For treatment of recurrent genital herpes:
    • Adults?125 mg two times a day for five days.
    • Children?Use and dose must be determined by your doctor.
  • For treatment of recurrent herpes virus infections of the mucousmembranes (lips and mouth) and genitals in HIV-infected patients:
    • Adults?500 mg two times a day for seven days.
    • Children?Use and dose must be determined by your doctor.

Missed dose?If you miss a dose of this medicine, take it assoon as possible. However, if it is almost time for your next dose, skip themissed dose and go back to your regular dosing schedule. Do not double doses.

Storage?To store this medicine:

• Keep out of the reach of children.
• Store away from heat and direct light.
• Do not store the tablets in the bathroom, near the kitchen sink,or in other damp places. Heat or moisture may cause the medicine to breakdown.
• Do not keep outdated medicine or medicine no longer needed. Be surethat any discarded medicine is out of the reach of children.

Precautions While Using This Medicine

If yoursymptoms do not improve within a few days, or if they become worse, checkwith your doctor.

The areas affected by herpes should be kept as clean and dry as possible.Also, wear loose-fitting clothing to avoid irritating the sores (blisters).

Side Effects of This Medicine

Along with its needed effects,a medicine may cause some unwanted effects. Although not all of these sideeffects may occur, if they do occur they may need medical attention.

Side effects may occur that usually do not need medical attention. Theseside effects may go away during treatment as your body adjusts to the medicine.However, check with your doctor if any of the following side effects continueor are bothersome:

More common

Less common

Other side effectsnot listed above may also occur in some patients. If you notice any othereffects, check with your doctor.