Acyclovir concentrations in human breast milk after valaciclovir administration

Jeanne S. Sheffield, Douglas N. Fish, Lisa M. Hollier, Sabrina Cadematori, Brenda J. Nobles, George D. Wendel

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

OBJECTIVE: The purpose of this study was to determine the valaciclovir and acyclovir pharmacokinetic profiles in serum and breast milk after valaciclovir administration to women after delivery. STUDY DESIGN: Valaciclovir (500 mg twice daily for 7 days) was given to 5 women after delivery who were breast-feeding healthy term infants. Matched serum and breast milk samples were obtained after the initial dose, on day 5 and 24 hours after the drug was discontinued. Infant urine was obtained on day 5. RESULTS: Valaciclovir was rapidly converted to acyclovir. The peak serum acyclovir concentration occurred 3 hours before the peak breast milk concentration (2.7 μg/mL at 1 hour vs 4.2 μg/mL at 4 hours). The serum acyclovir elimination half-life was 2.3 hours. The ratio of breast milk to serum acyclovir concentration was highest 4 hours after the initial dose at 3.4 and reached steady state ratio at 1.85. The median infant urine acyclovir concentration at steady state was 0.74 μg/mL. CONCLUSION: Valaciclovir is rapidly converted to acyclovir and concentrates in breast milk. However, the amount of acyclovir in breast milk after valaciclovir administration is considerably less (2%) than that used in therapeutic dosing of neonates.

Original languageEnglish (US)
Pages (from-to)100-102
Number of pages3
JournalAmerican Journal of Obstetrics and Gynecology
Volume186
Issue number1
DOIs
StatePublished - 2002

Fingerprint

valacyclovir
Acyclovir
Human Milk
Serum
Urine
Breast Feeding

Keywords

  • Acyclovir
  • Breast milk
  • Herpes simplex virus
  • Valaciclovir

ASJC Scopus subject areas

  • Medicine(all)
  • Obstetrics and Gynecology

Cite this

Sheffield, J. S., Fish, D. N., Hollier, L. M., Cadematori, S., Nobles, B. J., & Wendel, G. D. (2002). Acyclovir concentrations in human breast milk after valaciclovir administration. American Journal of Obstetrics and Gynecology, 186(1), 100-102. https://doi.org/10.1067/mob.2002.119183

Acyclovir concentrations in human breast milk after valaciclovir administration. / Sheffield, Jeanne S.; Fish, Douglas N.; Hollier, Lisa M.; Cadematori, Sabrina; Nobles, Brenda J.; Wendel, George D.

In: American Journal of Obstetrics and Gynecology, Vol. 186, No. 1, 2002, p. 100-102.

Research output: Contribution to journalArticle

Sheffield, JS, Fish, DN, Hollier, LM, Cadematori, S, Nobles, BJ & Wendel, GD 2002, 'Acyclovir concentrations in human breast milk after valaciclovir administration', American Journal of Obstetrics and Gynecology, vol. 186, no. 1, pp. 100-102. https://doi.org/10.1067/mob.2002.119183
Sheffield, Jeanne S. ; Fish, Douglas N. ; Hollier, Lisa M. ; Cadematori, Sabrina ; Nobles, Brenda J. ; Wendel, George D. / Acyclovir concentrations in human breast milk after valaciclovir administration. In: American Journal of Obstetrics and Gynecology. 2002 ; Vol. 186, No. 1. pp. 100-102.
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