Famcyclovir is a prescription drug used to treat viral infection, also called an antiviral. It is typically given for the treatment of: Prevention of herpes simplex infection, Treatment of herpes simplex infection, Treatment of herpes zoster (shingles), Treatment of varicella infection in patients with HIV Once in the body, Famvir is converted to the active molecule penciclovir. Penciclovir incorporates itself into the viral protein responsible for helping the virus to replicate. This action prevents the formation of more viral particles and slows or stops the infection. Fact Table Formula C14H19N5O4 License US FDA Bioavailability 75–77% Legal status Rx-only Chemical Name Famciclovir Elimination half-life 2–2.3 hours Dosage (Strength) 125mg, 250mg, 500mg Pregnancy Consult Doctor Brands Famvir Protein binding 20–25% PubChem CID 3324 MedlinePlus a694038 ChEBI 4974 ATC code J05AB09 DrugBank DB00426 KEGG D00317 Routes of administration Oral

Famvir (Famciclovir)

The dosage varies based on the type of virus and the location of the infection. Take Famvir exactly as prescribed by your doctor. Take Famvir with a full glass of water for each dose.
There are many potential side effects, including: Abnormal hepatic function tests, Anaphylactic shock, Anaphylaxis, Anemia, Angioedema, Cholestatic jaundice, Confusion, Delirium, Diarrhea, Disorientation, Dizziness, Drowsiness, Dysmenorrhea, Erythema multiforme, Eyelid edema, Facial edema, Fatigue, Flatulence, Hallucination, Headache, Hypersensitivity angiitis, Increased serum ALT, Increased serum AST, Increased serum bilirubin, Leukopenia, Migraine, Nausea, Neutropenia, Palpitations, Paresthesia, Periorbital edema, Pharyngeal edema, Pruritus, Seizure, Skin Rash, Stevens-Johnson syndrome, Thrombocytopenia, Toxic epidermal necrolysis, Urticaria, Vomiting Tell your doctor or pharmacist if you experience any of the above while taking Famvir.

Famvir (Famciclovir)

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Side Effects