Which antibiotic is generally avoided in pregnancy and why, and what are preferred alternatives?

• A. Aminoglycosides are avoided due to fetal hearing loss; preferred alternatives include tetracyclines and macrolides.
• B. Clindamycin is avoided due to fetal toxicity; preferred alternatives include fluoroquinolones.
• C. Metronidazole is avoided due to teratogenicity; preferred alternatives include sulfonamides.
• D. Doxycycline is avoided; safer alternatives include penicillins, cephalosporins, azithromycin; always consult guidelines.

Answer: (D)

Doxycycline is avoided in pregnancy because tetracyclines cross the placenta and can deposit in fetal bones and teeth, leading to permanent teeth discoloration and enamel defects, and potentially affecting bone development. Because of these risks, safer options are preferred. Penicillins and cephalosporins have solid safety data in pregnancy and cover many common infections, making them first-line choices when appropriate. If those aren’t suitable, a macrolide such as azithromycin is generally considered safer for use during pregnancy. Other antibiotic classes carry pregnancy-specific risks or require careful trimester-specific considerations, such as aminoglycosides (fetal ototoxicity and nephrotoxicity), fluoroquinolones (cartilage development concerns), and certain use-cases for metronidazole or sulfonamides. So, the safer approach is to choose penicillins, cephalosporins, or azithromycin first, with guidelines consulted for the exact infection and stage of pregnancy.