NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.

Drugs and Lactation Database (LactMed) [Internet]. Bethesda (MD): National Library of Medicine (US); 2006-.

Cover of Drugs and Lactation Database (LactMed)

Drugs and Lactation Database (LactMed) [Internet].

Show details


Last Revision: July 20, 2020.

Estimated reading time: 1 minute

CASRN: 139755-83-2

image 135021181 in the ncbi pubchem database

Drug Levels and Effects

Summary of Use during Lactation

Limited data indicate that sildenafil and its active metabolite in breastmilk are poorly excreted into breastmilk. Amounts ingested by the infant are small and would not be expected to cause any adverse effects in breastfed infants.

Drug Levels

Sildenafil is metabolized by CYP3A4 and 2C9 to the active metabolite, desmethylsildenafil, which has about on-half the potency of sildenafil.

Maternal Levels. A breastfeeding woman receiving sildenafil 20 mg for pulmonary hypertension. Breastmilk samples were taken 8 hours after a dose, followed by another dose 11 hours after the first. Then further milk samples were obtained about 3.5 and 6 hours after the second dose. The highest sildenafil and desmethylsildenafil milk levels of 4.49 mcg/L and 1.82 mcg/L, respectively, were in the second sample. Concentrations of sildenafil at the first and last samples were 1.64 and 1.67 mcg/L. Concentrations of desmethylsildenafil at the first and last sampling times were 1.18 and 1.73 mcg/L.[1]

Infant Levels. Relevant published information was not found as of the revision date.

Effects in Breastfed Infants

A 23-year-old woman with congenital heart disease and pulmonary hypertension was treated during pregnancy with sildenafil and bosentan in unspecified dosages. These drugs and warfarin were continued postpartum. Her infant was delivered at 30 weeks by cesarean section and weighed 1.41 kg at birth. She nursed the infant in the neonatal intensive care unit for 11 weeks "with good outcome" according to the authors, but the infant died at 26 weeks from a respiratory syncytial virus infection.[2]

Effects on Lactation and Breastmilk

Relevant published information was not found as of the revision date.


Wollein U, Schech B, Hardt J, et al. Determination and quantitation of sildenafil and its major metabolite in the breast milk of a lactating woman. J Pharm Biomed Anal. 2016;120:100–5. [PubMed: 26717019]
Molelekwa V, Akhter P, McKenna P, et al. Eisenmenger's syndrome in a 27 week pregnancy--management with bosentan and sildenafil. Ir Med J. 2005;98:87–8. [PubMed: 15869069]

Substance Identification

Substance Name


CAS Registry Number


Drug Class

Breast Feeding


Phosphodiesterase 5 Inhibitors

Urologic Agents

Vasodilator Agents

Disclaimer: Information presented in this database is not meant as a substitute for professional judgment. You should consult your healthcare provider for breastfeeding advice related to your particular situation. The U.S. government does not warrant or assume any liability or responsibility for the accuracy or completeness of the information on this Site.


Related information

Similar articles in PubMed

  • Review Paliperidone[Drugs and Lactation Database (...]
    Review Paliperidone
    . Drugs and Lactation Database (LactMed). 2006
  • Review Allopurinol[Drugs and Lactation Database (...]
    Review Allopurinol
    . Drugs and Lactation Database (LactMed). 2006
  • Review Celecoxib[Drugs and Lactation Database (...]
    Review Celecoxib
    . Drugs and Lactation Database (LactMed). 2006
  • Review Zaleplon[Drugs and Lactation Database (...]
    Review Zaleplon
    . Drugs and Lactation Database (LactMed). 2006
  • Review Mycophenolate[Drugs and Lactation Database (...]
    Review Mycophenolate
    . Drugs and Lactation Database (LactMed). 2006
See reviews...See all...

Recent Activity

Your browsing activity is empty.

Activity recording is turned off.

Turn recording back on

See more...