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Famvir Warnings and Precautions

To help ensure a safe treatment process, it is important to be aware of Famvir warnings and precautions before taking the medication. Prior to starting Famvir, let your healthcare provider know if you have kidney disease, galactose intolerance, or severe lactose intolerance. You should not take Famvir if you are allergic to any active or inactive components used to make the medicine or if you are allergic to Denavir (a medication that is very similar to Famvir).

Famvir: What Should I Tell My Healthcare Provider?

You should talk with your healthcare provider prior to taking Famvir® (famciclovir) if you have:
  • Kidney disease, including kidney failure (renal failure)
  • Very severe lactose intolerance
  • Galactose intolerance
  • Any allergies, including allergies to food, dyes, or preservatives.
Also let your healthcare provider know if you are:
  • Pregnant or thinking of becoming pregnant
  • Breastfeeding.
You should also make sure to tell your healthcare provider about all other medicines you are currently taking, including prescription and non-prescription medicines, vitamins, and herbal supplements.

Specific Precautions and Warnings With Famvir

Some warnings and precautions to be aware of prior to taking Famvir include:
  • The kidneys help remove Famvir from the body. If you have kidney disease, your healthcare provider should recommend a lower Famvir dosage for you.
  • Famvir will not cure genital herpes. You should avoid sexual contact while having an outbreak (or if you think you are about to have an outbreak). You should always use condoms, as genital herpes can be spread at any time.
  • Famvir should be started as soon as possible after the first signs of shingles, genital herpes, or cold sores, as it is most effective when taken early in the course of the infection.
  • Famvir is not approved for treating herpes infection of the eye, herpes infections that have spread throughout the body, or the first genital herpes infection a person experiences (although it is approved for subsequent outbreaks). Also, it is not approved to treat shingles in people with HIV or other immune system problems.
  • Famvir tablets contain lactose and should not be taken by people with galactose intolerance or very severe lactose intolerance.
  • Famvir is considered a pregnancy Category B medication. This means that it is probably safe for use during pregnancy. Talk with your healthcare provider about the risks and benefits of using the drug during pregnancy (see Famvir and Pregnancy).
  • It is not known if Famvir passes through breast milk. Therefore, if you are breastfeeding or plan to start breastfeeding, discuss this with your healthcare provider prior to taking the drug (see Famvir and Breastfeeding).
  • Famvir can potentially interact with a few other medications (see Famvir Drug Interactions).
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