Last update May 4, 2022


Very Low Risk

Safe. Compatible. Minimal risk for breastfeeding and infant.

Ampicillin is a beta-lactam antibiotic derived from penicillin used in the treatment of bacterial infections. Oral and parenteral administration every 4 to 6 hours.

Ampicillin is excreted in breast milk in clinically insignificant amounts (Rowe, 2013, Mylonas, 2011, Zhang, 1997, Fulton, 1992, Campbell 1991, Matsuda 1984), much lower than the dose used for newborns and infants. ( Chin, 2000; Reali, 2005)

No side effects have been observed in infants whose mothers were taking it except for some episodes of diarrhea or candidiasis due to altered intestinal flora. (Chin, 2000)

The possibility of transient gastroenteritis due to alteration of the intestinal flora in infants whose mothers take antibiotics should be taken into account. (Benyamini 2005, Ito 1993, Kafetzis 1981)

List of WHO essential medicines: compatible with breastfeeding. (WHO / UNICEF 2002)

See below the information of this related product:


We do not have alternatives for Ampicilline since it is relatively safe.

Suggestions made at e-lactancia are done by APILAM team of health professionals, and are based on updated scientific publications. It is not intended to replace the relationship you have with your doctor but to compound it. The pharmaceutical industry contraindicates breastfeeding, mistakenly and without scientific reasons, in most of the drug data sheets.

Jose Maria Paricio, Founder & President of APILAM/e-Lactancia

Your contribution is essential for this service to continue to exist. We need the generosity of people like you who believe in the benefits of breastfeeding.

Thank you for helping to protect and promote breastfeeding.

José María Paricio, founder of e-lactancia.

Other names

Ampicilline is also known as

Ampicilline in other languages or writings:


Ampicilline belongs to these groups or families:


Main tradenames from several countries containing Ampicilline in its composition:


Variable Value Unit
Oral Bioavail. 50 %
Molecular weight 349 daltons
Protein Binding 8 - 20 %
VD 0.4 l/Kg
pKa 3.24 -
Tmax 1 - 2 hours
1.3 hours
M/P ratio 0.58 -
Theoretical Dose 0.25 mg/Kg/d
Relative Dose 1.2 %
Ped.Relat.Dose 0.1 - 0.5 %


  1. Briggs GG, Freeman RK, Towers CV, Forinash AB. Drugs in Pregnancy and Lactation: A Reference Guide to Fetal and Neonatal Risk. Wolters Kluwer Health. Tenth edition (acces on line) 2015
  2. Schaefer C, Peters P, Miller RK. Drugs During Pregnancy and Lactation. Treatment options and risk assessment. Elsevier, Third Edition. 2015
  3. Rowe H, Baker T, Hale TW. Maternal medication, drug use, and breastfeeding. Pediatr Clin North Am. 2013 Feb;60(1):275-94. Abstract
  4. Mylonas I. Antibiotic chemotherapy during pregnancy and lactation period: aspects for consideration. Arch Gynecol Obstet. 2011 Abstract
  5. Benyamini L, Merlob P, Stahl B, Braunstein R, Bortnik O, Bulkowstein M, Zimmerman D, Berkovitch M. The safety of amoxicillin/clavulanic acid and cefuroxime during lactation. Ther Drug Monit. 2005 Abstract
  6. Reali A, Ximenes A, Cuzzolin L, Fanos V. Antibiotic therapy in pregnancy and lactation. J Chemother. 2005 Abstract
  7. WHO / UNICEF. BREASTFEEDING AND MATERNAL MEDICATION Recommendations for Drugs in the Eleventh WHO Model List of Essential Drugs. Department of Child and Adolescent Health and Development (WHO/UNICEF) 2002 Full text (link to original source) Full text (in our servers)
  8. Chin KG, Mactal-Haaf C, McPherson CE. Use of anti-infective agents during lactation: Part 1--Beta-lactam antibiotics, vancomycin, quinupristin-dalfopristin, and linezolid. J Hum Lact. 2000 Abstract
  9. Zhang Y, Zhang Q, Xu Z. [Tissue and body fluid distribution of antibacterial agents in pregnant and lactating women]. Zhonghua Fu Chan Ke Za Zhi. 1997 Abstract
  10. Ito S, Blajchman A, Stephenson M, Eliopoulos C, Koren G. Prospective follow-up of adverse reactions in breast-fed infants exposed to maternal medication. Am J Obstet Gynecol. 1993 May;168(5):1393-9. Abstract
  11. Fulton B, Moore LL. Antiinfectives in breastmilk. Part I: Penicillins and cephalosporins. J Hum Lact. 1992 Abstract
  12. Campbell AC, McElnay JC, Passmore CM. The excretion of ampicillin in breast milk and its effect on the suckling infant. Br J Clin Pharmacol;31:230p. Abstract. 1991 Full text (link to original source) Full text (in our servers)
  13. Matheson I, Samseth M, Sande HA. Ampicillin in breast milk during puerperal infections. Eur J Clin Pharmacol. 1988;34(6):657-9. Abstract
  14. Matsuda S. Transfer of antibiotics into maternal milk. Biol Res Pregnancy Perinatol. 1984;5(2):57-60. Abstract
  15. Kafetzis DA, Siafas CA, Georgakopoulos PA, Papadatos CJ. Passage of cephalosporins and amoxicillin into the breast milk. Acta Paediatr Scand. 1981 Abstract

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