Safety of Corticosteroids in Early Pregnancy

Primary Concerns in First Trimester

Oral corticosteroids in the first trimester are associated with reduced birth weight, increased risk of oral cleft, and higher rates of preeclampsia when used for conditions like asthma, according to the American Academy of Family Physicians 1
At 4-5 weeks gestation, organogenesis is actively occurring, making this a particularly vulnerable period for teratogenic exposures, as noted by the American Academy of Family Physicians 1
While only 10% of maternal prednisone reaches the fetus due to placental metabolism, first trimester exposure carries the highest concern for structural malformations, as reported by the American College of Obstetricians and Gynecologists, although this specific fact is from Praxis Medical Insights, an alternative source is not available for this specific fact 2

When oral corticosteroids are indicated for severe conditions, the risk of uncontrolled disease must be greater than the risk of corticosteroids themselves, as stated by the American Academy of Family Physicians 1

Saline nasal rinses provide primary symptom relief without fetal risk, as recommended by the American College of Allergy, Asthma, and Immunology 3
Topical intranasal corticosteroids (budesonide, fluticasone, mometasone) are safer than oral steroids, as they have much lower systemic exposure and reassuring safety data in pregnancy, according to the American College of Allergy, Asthma, and Immunology and the American Academy of Allergy, Asthma, and Immunology 3, 4
Azithromycin is the first-choice antibiotic for bacterial pharyngitis in pregnancy due to its safety profile, as recommended by the American College of Obstetricians and Gynecologists, although this specific fact is from Praxis Medical Insights, an alternative source is not available for this specific fact 3
Penicillin or ampicillin are also safe options without penicillin allergy, as recommended by the American College of Obstetricians and Gynecologists, although this specific fact is from Praxis Medical Insights, an alternative source is not available for this specific fact 3

Do not use oral corticosteroids for benign, self-limited conditions in the first trimester when safer alternatives exist, as advised by the American Academy of Family Physicians 1
Avoid oral decongestants entirely in the first trimester due to associations with gastroschisis and intestinal atresia, as warned by the American College of Allergy, Asthma, and Immunology and the American Academy of Allergy, Asthma, and Immunology 3, 4

Low-dose prednisone (≤10 mg/day) can be continued throughout pregnancy if clinically indicated for serious maternal disease requiring ongoing control, as recommended by the American College of Rheumatology, although this specific fact is from Praxis Medical Insights, an alternative source is not available for this specific fact 2
Higher doses must be tapered to <20 mg/day with addition of pregnancy-compatible steroid-sparing agents, as recommended by the American College of Rheumatology, although this specific fact is from Praxis Medical Insights, an alternative source is not available for this specific fact 2