Pregnancy and Anthrax Treatment
Doctors are often more confident about using amoxicillin than ciprofloxacin in pregnancy because they have more information on the safety of amoxicillin for the mother and the fetus. But in some situations, amoxicillin may not be effective against anthrax; the bacteria that cause anthrax can sometimes develop resistance to penicillins, such as amoxicillin. Before prescribing amoxicillin, your doctor will want to learn more about the specific place and situation of your exposure to anthrax, and also about your general medical history. (For instance, some women cannot take amoxicillin because they are allergic to it.)
Doxycycline can sometimes cause tooth and bone problems in the fetus. Therefore, you should not take doxycycline unless there is a specific reason why you cannot take either ciprofloxacin or amoxicillin.