Last update June 23, 2025

Josamycin

Likely Compatibility

Fairly safe. Mild or unlikely adverse effects. Compatible under certain circumstances. Follow-up recommended. Read Commentary.

Macrolide antibiotic authorised for use in paediatrics. Commonly used in young infants. Oral administration in two or more daily doses.

At the date of the last update, we found no published data on its excretion in breast milk.

It has a higher molecular weight and shorter elimination half-life than other macrolides (azithromycin, clarithromycin) that are excreted in insignificant amounts in breast milk. It is much more lipophilic than erythromycin.

Until more published data on this drug in relation to breastfeeding is available, safer known alternatives may be preferable, especially during the neonatal period and in cases of prematurity.

Early exposure to macrolides (especially erythromycin) has been linked to the onset of hypertrophic pyloric stenosis, even through breast milk, so it may be prudent to avoid them during the first month of breastfeeding.

Alternatives

  • Azithromycin (Safe product and/or breastfeeding is the best option.)
  • Clarithromycin (Safe product and/or breastfeeding is the best option.)
  • Erythromycin (Fairly safe. Mild or unlikely adverse effects. Compatible under certain circumstances. Follow-up recommended. Read Commentary.)

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

Josamycin is also known as


Josamycin in other languages or writings:

  • جوساميسين (Arabic)
  • Джозамицин (Cyrillic)
  • 交沙霉素 (Chinese)
  • ジョサマイシン (Japanese)
  • A stereoisomer of 7-(formylmethyl)-4,10-dihydroxy-5-methoxy-9,16-dimethyl-2-oxo-oxacyclohexadeca-11,13-dien-6-yl 3,6-dideoxy-4-O-(2,6-dideoxy-3-C-methyl-α-l-ribo-hexopyranosyl)-3-(dimethylamino)-β-d-glucopyranoside 4′-acetate 4′′-isovalerate (Chemical name)
  • C42H69NO15 (Molecular formula)
  • J01FA07 (ATC Code/s)

Group

Josamycin belongs to this group or family:

Tradenames

Main tradenames from several countries containing Josamycin in its composition:

Pharmacokinetics

Variable Value Unit
Oral Bioavail. 35 %
Molecular weight 828 daltons
Protein Binding 15 %
Tmax 1 hours
1.5 hours

References

  1. Periti P, Mazzei T, Mini E, Novelli A. Clinical pharmacokinetic properties of the macrolide antibiotics. Effects of age and various pathophysiological states (Part I). Clin Pharmacokinet. 1989 Abstract
  2. Wildfeuer A, Lemme JD. [The pharmacokinetics of josamycin]. Arzneimittelforschung. 1985 Abstract

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