Famciclovir

🧮 Dose calculator

Herpes labialis (cold sores) · Regimen source: FDA Famciclovir · 2.1

Enter age (weight is optional for this regimen).

👥 Special populations

• 🤰 PregnancyUse with caution

  Label states no clear risk or has limited data; use only if needed, under medical advice. FDA Famciclovir · 8.1

  “Risk Summary Available data from pharmacovigilance reports with famciclovir use in pregnant women have not identified a drug-associated risk of major birth defects, miscarriage or adverse maternal or fetal outcomes.”

• 🤱 BreastfeedingUse with caution

  Label: use with caution while breastfeeding; see the label text. FDA Famciclovir · 8.2

  “Risk Summary There are no data on the presence of famciclovir (prodrug) or penciclovir (active drug) in human milk, the effects on the breastfed infant, or the effects on milk production.”

• 👶 ChildrenUse with caution

  The label has conditions, age limits or notes for children; the label sentence is quoted below. FDA Famciclovir · 8.4

  “The efficacy of famciclovir has not been established in pediatric patients.”

• 👴 Older adultsUse with caution

  Label: use with caution in older adults, usually starting at the low end of the dose range. FDA Famciclovir · 8.5

  “In general, appropriate caution should be exercised in the administration and monitoring of famciclovir in elderly patients reflecting the greater frequency of decreased renal function and concomitant use of other drugs.”

• ⚥ Females & males of reproductive potentialUse with caution

  Label has advice on pregnancy testing, contraception or fertility for females and males. FDA Famciclovir · 8.3

  “Infertility Decreased fertility, due to testicular toxicity, was observed in male animals following repeated administration of famciclovir or penciclovir [see Nonclinical Toxicology ( 13.1 )].”