Standard Treatment for You and Your Baby

Penicillin is the only recommended treatment for preventing and curing congenital syphilis ^[1][2]. There are no proven alternatives for pregnant women or newborns, making it the “gold standard” of care ^[3].

The Penicillin Allergy Protocol

Because penicillin is the absolute only effective treatment, what happens if the mother or baby is allergic? Do not substitute with another antibiotic. Instead, the medical standard is to undergo a strict penicillin desensitization process in the hospital ^[2]. Doctors will give tiny, gradually increasing doses of penicillin in a highly monitored setting to teach the body to tolerate the drug. This ensures the patient can safely receive the cure they need.

Treatment During Pregnancy

To prevent passing the infection to the baby, a pregnant person must receive Benzathine penicillin G ^[1]. For the treatment to be considered “adequate” to protect the baby, two things must happen:

1. Correct Dosage: The number of shots must match the stage of the infection ^[4].
2. Timing: The full treatment must be completed at least 30 days before delivery ^[4][5]. If treatment is finished less than 30 days before birth, the baby is still considered at risk and will likely need treatment ^[6].

Treatment for the Newborn

If a baby is born with “proven” or “highly probable” congenital syphilis, the standard of care is Aqueous crystalline penicillin G ^[7][8].

• Method and Logistics: This is given through an intravenous (IV) line for 10 days ^[7][8]. Practically, this means your baby will likely need to stay in the hospital (often the NICU or pediatric floor) for those 10 days. Reassurance: You can absolutely still bond, hold, and feed your baby during this time! Nurses will help you navigate the IV lines safely. Breastfeeding is completely safe, provided you do not have any active, infectious syphilis sores on your breasts.
• Consistency is Key: Every dose must be given on time. If more than one day (24 hours) of consecutive therapy is missed, the entire 10-day course must be restarted from day one to ensure the bacteria are fully cleared ^[9]. Pro tip: Set alarms on your phone to remind yourself when the next dose is due, and don’t hesitate to politely remind your nursing staff.

Side Effects to Watch For

When treatment begins, you should be aware of the Jarisch-Herxheimer Reaction. This is a temporary, sometimes intense reaction that occurs within the first 24 hours of starting penicillin ^[10]. As the antibiotics rapidly kill the syphilis bacteria, the body responds to the dying cells. Symptoms can include:

• Fever and chills
• Muscle aches
• Drop in blood pressure
• Worsening of any rashes

Do not panic. This is a known, expected reaction—it does not mean the baby is allergic to the medication or that the infection is getting worse. The medical team will monitor your baby closely and provide supportive care to keep them comfortable.

Categories of Risk

Doctors use the mother’s treatment history and the baby’s symptoms to decide how long the baby needs treatment:

• Proven or Highly Probable: The baby has symptoms or high blood tests (titers). They must receive the 10-day IV course ^[11][7].
• Possible Infection: The baby looks normal, but the mother was not treated adequately. These babies also usually receive the 10-day course ^[12][13].
• Less Likely Infection: If the mother was treated correctly and early, the baby might only need a single shot of Benzathine penicillin G ^[12][10].

Addressing Penicillin Shortages

Occasionally, there are national shortages of the specific types of penicillin used for syphilis ^[14]. If you are told there is a shortage:

1. Ask for prioritization: Pregnant women and newborns are the highest priority for these medications ^[15].
2. Verify the drug: Ensure they are not substituting other antibiotics like azithromycin, as these are not recommended for treating the baby ^[2].