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Famvir Medication - Uses & Side Effects

Famvir is a prescription oral antiviral medication that is use for the treatment of recurrent genital herpes. It is indicated for the recurrent herpes simplex virus infections such as genital herpes and cold sores in HIV-infected patients.

Famvir Dosage

  • If you have Herpes Zoster, then the usual adult dose is 500 milligrams every 8 hours for 7 days.
  • For the treatment of Recurrent Genital Herpes, the usual dose is 125 milligrams twice a day for 5 days.

Uses of Famvir

  • Famciclovir is used to treat various type of herpes virus that may cause shingles.
  • It may also be used to treat other medical conditions those are listed in this medication guide.

Side Effects of Famvir

Before taken Famvir medicine, you should discuss the side effects with your doctor.  If any develop or change in intensity, then you should inform your doctor as soon as possible. Because only your doctor can determine if it is safe for you to continue taking Famvir. Side effects may include:

  • Constipation
  • Diarrhea
  • Fatigue
  • Headache
  • Nausea
  • Vomiting

Warnings and precautions before taking Famvir:

  • You should take this medicine at regular intervals.
  • After taken this drug, you may feel dizzy or drowsy. So you should be used caution engaging in activities requiring alertness such as driving or using machinery.
  • Before taking famciclovir, you should tell your doctor or pharmacist if you are allergic to it; or to penciclovir; or if you have any other allergies.

Drug Interaction :- If you are taking Famvir with certain other drugs, then the effects of either could be increased, decreased, or altered. So it is especially important to check with your doctor before combining Famvir with probenecid, a drug used to treat gout.


After taken Famvir if you feel that overdose is suspected, then you should contact with your doctor immediately. Because it may lead to another serious effect. Symptoms of Famvir overdose may include:

  • Seizures
  • Hallucinations
  • Kidney damage

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