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When is famciclovir contraindicated?

See the DrugPatentWatch profile for famciclovir

When Is Famciclovir Contraindicated?


Famciclovir is contraindicated in patients with known hypersensitivity to the drug or its components, such as penciclovir (its active metabolite).[1][2]

What About Cross-Hypersensitivity Risks?


Patients with prior hypersensitivity to penciclovir or related nucleoside analogs like acyclovir or ganciclovir should avoid famciclovir due to potential cross-reactivity.[1][2]

Can It Be Used in Pregnancy or Breastfeeding?


No absolute contraindication exists for pregnancy (Category B), but use only if benefits outweigh risks; limited human data available. Contraindicated in nursing mothers as it passes into breast milk.[1][3]

What If There's Kidney Impairment?


Not contraindicated, but dose adjustment required for creatinine clearance below 40 mL/min to prevent accumulation and toxicity.[1][2]

Are There Drug Interactions That Make It Unsafe?


No major contraindications, but caution with probenecid (increases penciclovir levels) or nephrotoxic drugs; monitor renal function.[1]

[1]: Famciclovir Prescribing Information (Famvir) - Novartis
[2]: Drugs.com - Famciclovir
[3]: Medscape - Famciclovir Dosing



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