DOC for syphilis in pregnancy:
**Core Concept**
Pregnancy is a contraindication for the use of penicillin G benzathine in the treatment of syphilis due to its potential for fetal toxicity. A safer alternative is required to prevent congenital syphilis.
**Why the Correct Answer is Right**
The recommended treatment for syphilis in pregnancy is the administration of benzathine penicillin G, but with a twist. Penicillin G benzathine is administered as a single dose at 2.4 million units, but with an additional 2.4 million units given 1 week later, to ensure adequate fetal and maternal coverage. This is crucial because syphilis in pregnancy can lead to congenital syphilis, which can cause severe morbidity and mortality in newborns.
**Why Each Wrong Option is Incorrect**
**Option A:** Doxycycline is contraindicated in pregnancy due to the risk of inhibiting bone growth and causing tooth discoloration in the fetus.
**Option B:** Azithromycin is not recommended as a first-line treatment for syphilis in pregnancy due to concerns about resistance and efficacy.
**Option C:** Ceftriaxone is not the preferred choice for treating syphilis in pregnancy, as it may not provide adequate coverage, and its efficacy in this setting is not well established.
**Clinical Pearl / High-Yield Fact**
In pregnant women with syphilis, a Jarisch-Herxheimer reaction, characterized by fever, headache, and rash, may occur within 24 hours after treatment, but this does not indicate a poor response to therapy.
**Correct Answer: D. Benzathine penicillin G is administered at 2.4 million units as a single dose followed by an additional 2.4 million units 1 week later.