Last update: July 31, 2018

1-Ethyl-1,4-dihydro-7-methyl-4-oxo-1,8-naphthyridine-3-carboxylic acid

Low Risk for breastfeeding


Moderately safe. Probably compatible.
Mild risk possible. Follow up recommended.
Read the Comment.

An antibacterial quinolone used in the treatment of urinary tract infections.
Oral administration 4 times a day.
Its use is authorized in infants from 3 months of age (Sanofi 2008).

It is excreted in breastmilk in clinically insignificant amounts (Traeger 1980), much lower than the dose used in infants.

Hemolysis has been observed in a newborn whose breastfeeding mother was taking nalidixic acid (Chin 2001 --> Belton 1965).

Until there is more published data on this drug in relation to breastfeeding, safer known alternatives may be preferable, especially during the neonatal period and in case of prematurity or glucose-6-phosphate dehydrogenase deficiency (WHO 2002).

The possible negativity of cultures in febrile infants whose mothers take antibiotics should be taken into account, as well as the possibility of gastroenteritis due to alteration of the intestinal flora (Ito 1993).

American Academy of Pediatrics: medication usually compatible with breastfeeding (AAP 2001).

Alternatives

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Other names

1-Ethyl-1,4-dihydro-7-methyl-4-oxo-1,8-naphthyridine-3-carboxylic acid is Nalidixic Acid in Chemical name.

Is written in other languages:

Group

1-Ethyl-1,4-dihydro-7-methyl-4-oxo-1,8-naphthyridine-3-carboxylic acid belongs to this group or family:

Tradenames

Main tradenames from several countries containing 1-Ethyl-1,4-dihydro-7-methyl-4-oxo-1,8-naphthyridine-3-carboxylic acid in its composition:

Pharmacokinetics

Variable Value Unit
Oral Bioavail. 96 %
Molecular weight 232 daltons
Protein Binding 93 %
VD 0,5 l/Kg
pKa 5,95 -
Tmax 1 - 2 hours
T1/2 1,1 - 7 hours
M/P ratio 0,08 - 0,13 -
Theoretical Dose 0,175 mg/Kg/d
Relative Dose 0,5 %
Relat.Ped.Dose 0,3 %

References

  1. Sanofi. Nalidixic acid. Drug Summary. 2008 Full text (in our servers)
  2. 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)
  3. AAP - American Academy of Pediatrics Committee on Drugs. Transfer of drugs and other chemicals into human milk. Pediatrics. 2001 Sep;108(3):776-89. Abstract Full text (link to original source) Full text (in our servers)
  4. Chin KG, McPherson CE 3rd, Hoffman M, Kuchta A, Mactal-Haaf C. Use of anti-infective agents during lactation: Part 2--Aminoglycosides, macrolides, quinolones, sulfonamides, trimethoprim, tetracyclines, chloramphenicol, clindamycin, and metronidazole. J Hum Lact. 2001 Feb;17(1):54-65. Abstract
  5. 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
  6. Traeger A, Peiker G. Excretion of nalidixic acid via mother's milk. Arch Toxicol Suppl. 1980 Abstract
  7. Belton EM, Jones RV. Haemolytic anaemia due to nalidixic acid. Lancet. 1965 Abstract

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