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See the DrugPatentWatch profile for famciclovir
Famciclovir is contraindicated in patients with known hypersensitivity to the drug or its components, such as penciclovir (its active metabolite).[1][2]
Patients with prior hypersensitivity to penciclovir or related nucleoside analogs like acyclovir or ganciclovir should avoid famciclovir due to potential cross-reactivity.[1][2]
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]
Not contraindicated, but dose adjustment required for creatinine clearance below 40 mL/min to prevent accumulation and toxicity.[1][2]
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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