First-Line Antibiotics During Pregnancy

Safe First-Line Antibiotics in Pregnancy

The American Academy of Dermatology recommends penicillins, such as amoxicillin, and cephalosporins, such as cephalexin, as first-line antibiotics during pregnancy due to their established safety profiles and effectiveness against common infections 1, 2
Cephalosporins, including cephalexin, are considered safe alternatives for penicillin-allergic patients without a history of anaphylaxis, according to the MMWR Recommendations and Reports and the European Respiratory Journal 2, 3
Azithromycin is safe for use in pregnancy, with no adverse effects reported in studies of pregnant patients, as stated in the Journal of the American Academy of Dermatology 1
Clindamycin has moderate evidence supporting its safety in pregnancy, but should be used with awareness of potential gastrointestinal effects in infants if used while breastfeeding, according to the Journal of the American Academy of Dermatology and MMWR Recommendations and Reports 1, 4

The Centers for Disease Control and Prevention (CDC) recommends penicillin G as the first-line treatment for Group B Streptococcal infection, with an initial dose of 5 million units IV, followed by 2.5 million units IV every 4 hours until delivery 2, 5
For patients with a penicillin allergy without anaphylaxis risk, cefazolin is recommended as an alternative, with an initial dose of 2 g IV, followed by 1 g IV every 8 hours 2
For patients with a penicillin allergy and anaphylaxis risk, clindamycin or vancomycin may be used if susceptibility testing confirms sensitivity, as stated in the MMWR Recommendations and Reports 2

The CDC recommends erythromycin base, 500 mg orally four times daily for 7 days, or amoxicillin, 500 mg orally three times daily for 7-10 days, for the treatment of chlamydia in pregnant women 4, 6
Azithromycin, 1 g orally in a single dose, may be considered as an alternative treatment for chlamydia, according to the MMWR Recommendations and Reports 4

Tetracyclines, including doxycycline, are contraindicated after the fifth week of pregnancy due to the risk of dental staining and potential bone growth inhibition in the fetus, as stated in the European Respiratory Journal 3
Trimethoprim-sulfamethoxazole (TMP-SMX) should be avoided, particularly in the first trimester, due to the potential risk of birth defects and near term due to the risk of neonatal hyperbilirubinemia, according to the Journal of the American Academy of Dermatology 1
Aminoglycosides should be avoided when possible due to the potential risks of ototoxicity and nephrotoxicity in the fetus, as stated in the European Respiratory Journal 3

The CDC recommends that all pregnant women be screened for asymptomatic bacteriuria and Group B Streptococcus (at 35-37 weeks gestation), and that prophylactic antibiotics not be used before the intrapartum period to treat GBS colonization, as stated in the MMWR Recommendations and Reports 2, 7
Antimicrobial stewardship is essential to avoid unnecessary antibiotic use during pregnancy, and treatment duration should be guided by the specific infection and severity, according to the MMWR Recommendations and Reports 2