Syphilis Treatment in Pregnancy: Penicillin Protocol, Timing & Fetal Protection

Standard of Care

Penicillin G benzathine (Bicillin L-A) is the ONLY recommended treatment for syphilis in pregnancy. No alternatives are proven to prevent congenital syphilis reliably.

Regimen by Stage (CDC 2021 Guidelines)

Critical Pregnancy-Specific Points

• Treat ASAP: Ideally within 30 days of diagnosis; definitely >30 days before delivery to prevent congenital transmission.
• Penicillin allergy: Desensitization is mandatory. No alternative (doxycycline, ceftriaxone, azithromycin) adequately treats fetus. Desensitize → treat with penicillin.
• Jarisch-Herxheimer reaction: Fever, chills, contractions – monitor fetal heart tones; usually self-limited.
• Partner treatment: Essential to prevent reinfection.

Follow-Up & Monitoring

• Serology (RPR/VDRL): Baseline, 28–32 weeks, delivery. 4-fold titer decline expected.
• Ultrasound: Assess for fetal signs: hepatosplenomegaly, ascites, hydrops, thickened placenta, IUGR.
• At delivery: Infant RPR/VDRL (quantitative), physical exam, CSF if indicated, long-bone X-rays.

Congenital Syphilis Prevention

• Adequate maternal treatment ≥30 days before delivery = <2% transmission.
• Inadequate/late treatment = up to 60–80% transmission; severe outcomes: stillbirth, neonatal death, neuro/ocular/hearing deficits, bone deformities.
• All pregnant women should be screened at first prenatal visit; repeat at 28 weeks & delivery in high-prevalence areas/risk factors.

Key Takeaway

Penicillin + desensitization if allergic + timely treatment + partner treatment = effective prevention of congenital syphilis. There is no safe alternative in pregnancy.

This is clinical guidance; individual management by OB/MFM/ID specialist. CDC STI Treatment Guidelines 2021 are current standard.

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Stage	Regimen	Dosing
Primary, Secondary, Early Latent (<1 yr)	Penicillin G benzathine 2.4 million units IM	Single dose
Late Latent (≥1 yr) or Unknown Duration	Penicillin G benzathine 2.4 million units IM	3 doses at 1-week intervals (total 7.2M units)
Neurosyphilis / Ocular / Otosyphilis	Penicillin G aqueous crystalline 18–24M units/day IV	10–14 days (inpatient)