Which antibiotic class is generally considered safe to use during pregnancy and is commonly recommended as an alternative to doxycycline?

• A. Penicillins
• B. Doxycycline
• C. Tetracycline
• D. Chloramphenicol

Answer: (A)

In pregnancy the safety of the fetus guides antibiotic choice. Penicillins have a long, well-established safety record in pregnancy and are generally considered safe (Category B in many labeling systems). They cross the placenta but have not been associated with fetal malformations, and they cover many common infections encountered in pregnant patients. Because doxycycline is a tetracycline, it carries risks to the developing fetus—primarily effects on teeth and bone growth—so it is avoided during pregnancy. A drug class that is known to be safer for the fetus and widely used as a substitute when doxycycline isn’t appropriate is penicillins.

Chloramphenicol is avoided in pregnancy due to risks like gray baby syndrome and potential bone-marrow suppression in the neonate, and tetracyclines themselves cause dental discoloration and enamel hypoplasia, so they are not suitable alternatives. Allergy considerations may also influence the choice, but when a safe, effective alternative is needed, penicillins are preferred.