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Famciclovir is a prodrug that is used to treat herpes virus infections in humans and cats. Famciclovir is converted into penciclovir through a two-step process in the blood and in the liver. Penciclovir inhibits herpes virus DNA synthesis. The half-life of penciclovir in a herpes-infected cell is considerably longer than the half-life in plasma. Famciclovir/penciclovir is virostatic, not virucidal.
Oral famciclovir is well-absorbed by humans. The absorption and blood levels are much more variable in the cat. This is thought to be due to either poor intestinal absorption or a lack of the appropriate hepatic enzyme for the conversion of famciclovir to penciclovir.
Despite the complex pharmacokinetics of famciclovir/penciclovir, recent studies have demonstrated that the oral administration of famciclovir "improved outcomes for systemic, ophthalmic, clinicopathologic, virologic, and histologic variables in cats experimentally infected with FHV-1." (Thomasy et al. 2011) Earlier work by Malik et al. in 2009 showed improvement in ocular, sinus, and dermatologic manifestations in cats with clinical FHV-1 that were treated with famciclovir.
We can let your veterinarian know that you are interested in our compounded Famciclovir.
May Be Prescribed by Vets for:
Herpes virus infection
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Barbara Forney, VMD
Dr. Barbara Forney is a veterinary practitioner in Chester County, Pennsylvania. She has a master's degree in animal science from the University of Delaware and graduated from the University of Pennsylvania School of Veterinary Medicine in 1982.
She began to develop her interest in client education and medical writing in 1997. Recent publications include portions of The Pill Book Guide to Medication for Your Dog and Cat, and most recently Understanding Equine Medications published by the Bloodhorse.
Dr. Forney is an FEI veterinarian and an active member of the AAEP, AVMA, and AMWA.
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This content is intended for counseling purposes only. This content is informational/educational and is not intended to treat or diagnose any disease or patient. No claims are made as to the safety or efficacy of mentioned preparations. The compounded medications featured in this content have been prescribed and/or administered by prescribers who work with Wedgewood Pharmacy. You are encouraged to speak with your prescriber as to the appropriate use of any medication. Wedgewood Pharmacy’s compounded veterinary preparations are not intended for use in food and food-producing animals. All product and company names are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them.