toxylact: A07AA09 Vancomycin

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A07AA09 comprises oral vancomycin, a glycopeptide antibiotic used as a locally acting intestinal anti‑infective; oral vancomycin is likely to produce low exposure in breastfed infants because it is poorly absorbed from the maternal gastrointestinal tract, but some product information recommends temporary interruption of breastfeeding as a precaution in neonates.atcddd.fhi+4

Drug and ATC classification

Vancomycin is a tricyclic glycopeptide antibacterial agent obtained from Streptomyces orientalis, active mainly against Gram‑positive bacteria including Clostridioides difficile and methicillin‑resistant Staphylococcus aureus (MRSA).wikipedia+4
In the ATC system, oral vancomycin used for intestinal infections is classified as A07AA09 within the subgroup A07AA (intestinal antibiotics).atcddd.fhi+4
Oral formulations (capsules or solutions) are indicated primarily for C. difficile‑associated diarrhoea and enterocolitis and for enterocolitis caused by Staphylococcus aureus, where the drug acts within the intestinal lumen.drugbank+4

Pharmacology and toxicology

Vancomycin inhibits bacterial cell wall synthesis by binding to D‑alanyl‑D‑alanine termini of peptidoglycan precursors, leading to defective cell wall formation and bacterial death.wikipedia+2
When administered orally for intestinal indications, vancomycin is poorly absorbed from the gastrointestinal tract, so it acts mainly in the intestinal lumen and does not achieve therapeutic concentrations in other tissues.medlineplus+1
Systemic vancomycin (intravenous) is associated with nephrotoxicity, ototoxicity, infusion‑related reactions, and “red man” syndrome, but these toxicities are largely related to high systemic exposure and are not expected with standard oral intestinal therapy, although some systemic absorption may occur in patients with severe colitis or mucosal damage.drugs+2

Use in lactation

General lactation resources note that most antibiotics do not reach hazardous levels in breast milk and can often be used during breastfeeding after individual risk–benefit assessment.ncbi.nlm.nih+3
For oral vancomycin (A07AA09), poor gastrointestinal absorption suggests that maternal plasma concentrations and milk transfer are likely to be low in women with intact intestinal mucosa.atcddd.fhi+3
However, some product characteristics for oral vancomycin capsules recommend stopping breastfeeding during treatment, particularly because of theoretical risks of systemic exposure in premature and very young infants if clinically relevant amounts were to appear in milk.medicines+1

Clinical considerations in breastfeeding women

Before prescribing, clinicians should verify that the intended use is an oral intestinal formulation (A07AA09) rather than systemic intravenous therapy, as systemic vancomycin carries a substantially higher risk of nephrotoxicity, ototoxicity, and other serious adverse effects.atcddd.fhi+3
When oral vancomycin is necessary in a breastfeeding mother, an individualized approach is advisable: consider the age and maturity of the infant, the severity of maternal disease (e.g. C. difficile colitis), and the potential need for temporary interruption of breastfeeding in high‑risk neonates.medicines+2
Reference to specialized lactation databases and expert guidance is recommended, as some authorities may accept continued breastfeeding with monitoring in older, healthy infants, while others prefer a precautionary suspension of breastfeeding for the duration of therapy.

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