WHAT TO KNOW
Treatment with famciclovir should be started as soon as possible after the first appearance of symptoms (e.g. tingling, burning, blisters). Take all of the famciclovir that has been prescribed for you even if you begin to feel better. Your symptoms may start to improve before the infection is completely treated. Herpes infections are contagious and you can infect other people, even during treatment. Avoid letting infected areas come into contact with other people. Wash your hands frequently to prevent transmission.

WHAT IS IT
Famciclovir is an antiviral drug. It slows the growth and spread of the herpes virus so that the body can fight off the infection. Famciclovir shortens the length of time symptoms are present. Famciclovir is used to treat infections caused by herpes viruses including shingles, genital herpes, and cold sores (in people with HIV)

HOW TO TAKE THIS MEDICATION
Take famciclovir exactly as directed by your doctor. If you do not understand these directions, ask your pharmacist, nurse, or doctor to explain them to you. Treatment with famciclovir should be started as soon as possible after the first appearance of symptoms (e.g. tingling, burning, blisters). Take each dose with a full glass of water. Famciclovir can be taken with or without food. Taking famciclovir with food may decrease stomach upset. Take all of the famciclovir that has been prescribed for you even if you begin to feel better

MISSED DOSE
Take the missed dose as soon as you remember. However, if it is almost time for the next regularly scheduled dose, skip the missed dose and take the next one as directed. Do not take a double dose of this medication unless otherwise directed by your doctor.

OVER DOSE
Seek emergency medical attention. A famciclovir overdose has no known symptoms, but an overdose of acyclovir (Zovirax), which is a similar drug, may cause seizures, hallucinations, and kidney damage (decreased urine production).

SIDE EFFECTS
Stop taking famciclovir and seek emergency medical attention if you experience:

an allergic reaction (difficulty breathing; closing of your throat; swelling of your lips, tongue, or face; or hives)

Other, less serious side effects may be more likely to occur. Continue to take famciclovir and talk to your doctor if you experience:

nausea or vomiting

a headache

diarrhea

dizziness, tingling in your hands or feet

itching

PRECAUTIONS
Do not take famciclovir if you are allergic to penciclovir (Denavir) without first talking to your doctor. Before taking this medication, tell your doctor if you have kidney disease. You may need a dosage adjustment or special monitoring during treatment with famciclovir.

DRUG INTERACTIONS
Probenecid (Benemid) may increase the effects of famciclovir and lead to dangerous side effects. You may need a dosage adjustment or special monitoring during treatment if you are taking probenecid.