Antibiotic Treatment Guidelines

Recommended Regimens

• Azithromycin is recommended as the first-line treatment for chlamydial infections in pregnant women, with a single 1g oral dose, due to its high compliance rate, demonstrated safety in pregnancy, and proven efficacy against chlamydial infections, as recommended by the CDC and other authorities 1, 2, 3, 4, 5, 6, 7
• Amoxicillin 500mg orally three times daily for 7 days is recommended as an alternative treatment for chlamydial infections, as recommended by the Centers for Disease Control and Prevention 8
• Erythromycin base 500mg orally four times daily for 7 days is recommended as an alternative treatment for chlamydial infections, as recommended by the Centers for Disease Control and Prevention 8
• Ceftriaxone 250mg IM as a single dose is recommended as a first-line treatment for chlamydia infection in pregnant women who cannot tolerate oral medications, which also covers potential co-infection with gonorrhea, as recommended by the CDC and other authorities 1, 9
• Spectinomycin 2g IM as a single dose is recommended as an alternative treatment, if available, as recommended by the CDC and other authorities 9
• Metronidazole 500mg orally twice daily for 7 days is recommended as a treatment regimen, as recommended by the CDC and other authorities 10
• Clindamycin 300mg orally twice daily for 7 days is recommended as an alternative treatment, as recommended by the CDC and other authorities 10
• Penicillin is the only proven effective treatment for preventing maternal transmission of syphilis to the fetus, with the appropriate regimen depending on the stage of infection, as recommended by the CDC 11, 12

Contraindicated Medications

• Doxycycline is contraindicated during pregnancy due to risk of dental staining and inhibition of bone growth in the fetus, as stated by the CDC and other authorities 1, 2, 4, 8, 13, 11
• Fluoroquinolones are contraindicated during pregnancy due to potential fetal harm, as stated by the CDC and other authorities 1, 2, 4, 8, 13, 11
• Erythromycin estolate is contraindicated due to risk of maternal hepatotoxicity, as stated by the CDC and other authorities 8
• Clarithromycin should be used with caution during pregnancy as it has been demonstrated to be a teratogen in animals, as stated by the CDC and other authorities 6, 7

Important Considerations

• All pregnant women should be screened serologically for syphilis early in pregnancy, with serologic titers repeated in the third trimester and at delivery, as recommended by the CDC 11, 12, 4, 8
• Pregnant women <25 years of age are at high risk for chlamydial infection and should be screened, as recommended by the CDC and other authorities 8, 11
• Azithromycin does not require dose adjustment during pregnancy and is considered safe, with no adverse effects reported, as stated by North American clinical practice guidelines and the American Academy of Dermatology guidelines 14, 3
• Azithromycin should not be used concomitantly with medications that can prolong the QT interval due to the risk of cardiac arrhythmias, as warned by the American Academy of Dermatology 15
• Caution is advised when co-administering azithromycin with protease inhibitors, as they may affect drug levels, according to the CDC and other authorities 6, 7
• The CDC recommends test of cure 3 weeks after treatment completion for pregnant women, preferably by nucleic acid amplification test (NAAT), to ensure therapeutic cure and prevent sequelae in both mother and neonate 1, 2, 4, 8, 11
• Patients should abstain from sexual intercourse until both they and their partners have completed treatment, as recommended by the CDC and other authorities 1, 2, 8, 11
• Treatment of sex partners is essential to prevent reinfection, and all patients with STDs should be offered HIV testing, as recommended by the CDC and other authorities 11, 12, 4