Which of the following medications is NOT considered safe for a pregnant patient?

• A. Amoxicillin
• B. Doxycycline
• C. Azithromycin
• D. Ceftriaxone

Answer: (B)

In pregnancy, choosing an antibiotic hinges on fetal safety data and the absence of teratogenic effects. Doxycycline belongs to the tetracycline family, which can cross the placenta and affect fetal bone development and tooth formation. It can cause permanent tooth discoloration and enamel hypoplasia, and because of these potential effects, it is avoided during pregnancy and in young children. That’s why it’s not considered safe for a pregnant patient.

The other drugs listed have longer histories of use in pregnancy with no proven teratogenic risks at standard doses. Amoxicillin, a penicillin, is widely regarded as safe for treating many common infections in pregnant patients. Azithromycin, a macrolide, is generally considered safe when a macrolide is needed due to allergy or intolerance to penicillin. Ceftriaxone, a cephalosporin, is also used in pregnancy when clinically indicated and has a reassuring safety profile. The key idea is that these medications do not carry the known fetal risks associated with tetracyclines like doxycycline, making them safer choices during pregnancy when appropriate for the infection being treated.