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Azithromycin

Macrolide Antibiotic

FDA Category B (No Fetal Risk in Human/Animal Studies) FDA Category B & CDC Endorsed
Safe — Preferred Macrolide Antibiotic

Azithromycin (Zithromax) is FDA Category B and the preferred macrolide antibiotic in pregnancy for Chlamydia, respiratory, and soft tissue infections.

Medical Disclaimer: This report is for educational and informational purposes only. It does not replace professional medical advice. Always consult your healthcare provider before making any medication decisions during pregnancy.
Pregnancy Summary
Clinical overview for pregnancy

Azithromycin is well-tolerated and safe throughout all trimesters of pregnancy.

Trimester Safety Timeline
Safety profile across all three trimesters
1st Trimester
Weeks 1 – 12
Safe

Safe. Preferred macrolide.

2nd Trimester
Weeks 13 – 27
Safe

Safe for urogenital and respiratory infections.

3rd Trimester
Weeks 28 – Birth
Safe

Safe through delivery.

Placental Transfer
Does this medication cross the placenta?
Crosses Placenta
Yes
Transfer Extent
Low to Moderate

Low umbilical cord blood levels relative to maternal serum.

Fetal Risk Assessment
Potential effects on the developing fetus
No Teratogenicity

Large prospective studies show no elevated risk of major structural birth defects.

Maternal Risk Assessment
Potential maternal side effects during pregnancy
Mild GI Upset

Mild abdominal cramping or nausea.

Clinical Recommendation
Professional prescribing guidance
Preferred Macrolide Option

First-choice macrolide antibiotic in penicillin-allergic patients.

If Already Taken
"I took this before knowing I was pregnant"
1
Complete Course

Complete prescribed dosage.

Pregnancy Monitoring Protocol
Recommended follow-up and surveillance
Clinical Follow-up
  • Monitor resolution of infection symptoms
Safer Alternatives
Active ingredients with better pregnancy safety profiles
amoxicillin
First-line penicillin alternative.
Safe
Professional Clinical Notes
Key prescribing considerations and clinical pearls
  • CDC Guidelines: Azithromycin is first-line for Chlamydia trachomatis in pregnancy.
Patient-Friendly Explanation
In simple, easy-to-understand language
Easy to Understand

Azithromycin (Zithromax) is a safe antibiotic to take during pregnancy.

Frequently Asked Questions
Common questions about Azithromycin in pregnancy

Yes, Azithromycin is Category B and widely prescribed for infections during pregnancy.

Evidence Level
Quality of available safety data
FDA Category B & CDC Endorsed

CDC Treatment Guidelines & FDA PLLR Category B.

References & Primary Sources
Official U.S. Food & Drug Administration (FDA) PLLR & ACOG Clinical Database
All pregnancy safety evaluations, risk categories, and drug monographs are compiled directly from U.S. FDA Pregnancy and Lactation Labeling Rule (PLLR) standards and approved FDA prescribing labels.
  1. 1
    U.S. Food and Drug Administration (FDA) PLLR — FDA Pregnancy and Lactation Labeling Rule & Approved Prescribing Information Database Last updated: Official FDA Standard
  2. 2
    FDA Center for Drug Evaluation and Research (CDER) — FDA MedWatch & Black Box Warning Database Last updated: Official FDA Standard
  3. 3
    ACOG Practice Bulletins & Guidelines — American College of Obstetricians and Gynecologists Clinical Recommendations Last updated: 2025 Clinical Edition
  4. 4
    Briggs Drugs in Pregnancy and Lactation — Reference Guide to Fetal and Neonatal Risk (12th Edition) Last updated: 2025 Clinical Edition
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