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Feb 13, 2026 - 09:58 AM
We’ve provided several answers to questions related to Famvir (Famciclovir) , see some other helpful Q&A related to this product.
Question: Can Famvir cause diarrhea?
Answer: Yes, Famvir (famciclovir) can cause diarrhea as a possible side effect. Not everyone experiences this, but if diarrhea is severe or persistent, you should contact your healthcare provider.
Question: Is famciclovir good for shingles?
Answer: Yes, famciclovir is effective for treating shingles (herpes zoster). It is an antiviral medication that helps reduce the severity and duration of symptoms if started early. Famciclovir may also help decrease the risk of complications, such as postherpetic neuralgia.
Question: Can famciclovir cause hives?
Answer: Yes, famciclovir can cause hives as a rare side effect. Hives are a sign of an allergic reaction, so if you develop them while taking famciclovir, you should contact your doctor immediately.
Question: What are the directions for taking this medication?
Answer: Take the medication exactly as prescribed by your doctor, with a full glass of water for each dose. Following proper directions ensures the drug works effectively and reduces the risk of side effects.
Question: What conditions is this medication used to treat?
Answer: It is used for the prevention and treatment of herpes simplex infection, treatment of herpes zoster (shingles), and treatment of varicella infection in patients with HIV. Treating these viral infections helps reduce symptoms, speed healing, and prevent complications.
Question: Does this medication contain lactose?
Answer: Yes, the tablets contain lactose. Lactose content matters for people with lactose intolerance, who may need to avoid or adjust their treatment.
Question: What is the active ingredient in this medication?
Answer: The active ingredient is famciclovir. Knowing the active ingredient is important for avoiding duplicate therapies or allergic reactions.
Question: What is the KEGG code for this medication?
Answer: The KEGG code is D00317. KEGG (Kyoto Encyclopedia of Genes and Genomes) codes are used in bioinformatics to link drugs to biological pathways.
Question: What is the DrugBank ID for this medication?
Answer: The DrugBank ID is DB00426. DrugBank IDs are helpful for finding scientific and pharmacological information about a drug.
Question: What is the ATC code for this drug?
Answer: The ATC code is J05AB09. ATC (Anatomical Therapeutic Chemical) codes help categorize drugs for research and pharmacy use.
Question: What is the ChEBI identifier for this medicine?
Answer: The ChEBI identifier is 4974. ChEBI stands for Chemical Entities of Biological Interest, a database that provides detailed chemical information.
Question: What is the MedlinePlus code for this drug?
Answer: The MedlinePlus code is a694038. MedlinePlus codes allow for easy access to reliable, up-to-date health information about the drug.
Question: What is the PubChem CID number for this drug?
Answer: The PubChem CID is 3324. PubChem CID is a unique identifier for chemicals, useful for research and cross-referencing scientific information.
Question: What is the license authority for this medication?
Answer: This medication is licensed by the US FDA (United States Food and Drug Administration). FDA approval means the drug has been reviewed for safety and effectiveness.
Question: What is the brand name for this medication?
Answer: The brand name is Famvir. Brand names can help you identify the product at the pharmacy and ensure you receive the correct medication.
Question: What is the route of administration for this medicine?
Answer: The medication is taken orally (by mouth). Oral administration is convenient and easy for most patients to manage.
Question: What is the legal status of this medication?
Answer: It is Rx-only, which means it is available by prescription only. Prescription-only status ensures that a healthcare provider supervises your treatment for safety and effectiveness.
Question: What is the elimination half-life of this drug?
Answer: The elimination half-life is 2–2.3 hours, which is the time it takes for half the drug to be removed from your body. Knowing the half-life helps determine how often you need to take the medication to maintain effective levels.
Question: What is the protein binding percentage?
Answer: Protein binding is 20–25%, meaning that portion of the drug attaches to proteins in your blood. This affects how much active medication is available to fight the infection, which can influence dosing and effectiveness.
Question: What is the bioavailability of this drug?
Answer: The bioavailability is 75–77%, which means that about three-quarters of the medication enters your bloodstream when taken by mouth. High bioavailability ensures that you receive a predictable and effective dose.
Question: What strengths does this medication come in?
Answer: It is available in 125mg, 250mg, and 500mg tablets. Having multiple strengths allows your doctor to tailor the dosage to your specific condition, ensuring effective treatment while minimizing side effects.
Question: What is the chemical name of this drug?
Answer: The chemical name is famciclovir. The chemical name is important for identifying the active ingredient and understanding how it works in the body.
Question: What is the formula of this medication?
Answer: The formula is C14H19N5O4, which means it contains 14 carbon, 19 hydrogen, 5 nitrogen, and 4 oxygen atoms. Knowing the formula helps pharmacists and healthcare professionals identify the drug's composition and check for potential allergies.
