Amoxicillin
1. Pregnancy Evidence & Regulatory Labeling
FDA Pregnancy and Lactation Labeling Rule (PLLR 8.1) & EMA SmPC Section 4.6
Clinical Risk Summary
Amoxicillin is considered first-line and safe during all trimesters of pregnancy. Epidemiological data from thousands of documented human pregnancies have shown no increase in congenital abnormalities, miscarriage, or adverse perinatal outcomes.
Human Pregnancy Experience & Clinical Studies
Surveillance studies in >10,000 first-trimester exposed pregnancies confirm safety profile identical to unexposed controls.
Animal Reproductive & Developmental Toxicity Data
Reproduction studies in mice and rats at doses up to 10-times human dose revealed no evidence of impaired fertility or fetal harm.
Clinical Considerations for Prescribers
Standard therapeutic dosing for respiratory, urinary tract, and dental infections. Pregnancy increases renal clearance and volume of distribution; standard or higher-frequency dosing may be required to maintain therapeutic MIC.
Placental Transfer
Readily crosses the placenta, achieving therapeutic amniotic fluid and fetal serum concentrations.
2. Lactation & Breastfeeding Safety
NIH / NLM LactMed® Database & FDA Labeling Section 8.2
Summary of Use during Lactation
Amoxicillin is considered compatible with breastfeeding by the AAP and NIH LactMed. Trace amounts in breast milk rarely cause adverse effects beyond transient loose stools or thrush (Candida).
Drug Levels in Breast Milk & Relative Infant Dose
Peak milk concentration occurs 4 to 5 hours post-dose (mean 0.9 mg/L; milk-to-plasma ratio ~0.014 to 0.043).
Effects in Breastfed Infants & Monitored Signs
Occasional mild diarrhea, diaper rash, or oral thrush due to infant gastrointestinal flora alteration.
Effects on Lactation & Milk Production
No effect on milk volume.
Alternate Medications with Established Lactation Data
4. Regulatory Source Provenance & Comparison
Direct attribution to official regulatory documents without synthesized consensus
| Regulatory Organization | Jurisdiction | Document / Framework | Effective Date | Official Source Link |
|---|---|---|---|---|
|
U.S. Food and Drug Administration (FDA)
FDA Prescribing Information (PLLR)
|
United States | regulatory_label | 2026-07-01 | Official Record |
|
National Institutes of Health (NIH) / NLM
LactMed® Database (Drugs and Lactation)
|
United States / Global | evidence_monograph | 2026-08-01 | Official Record |