Can You Take Antibiotics While Pregnant or Breastfeeding?

Untreated bacterial infections during pregnancy carry their own real risks, so the goal generally isn't avoiding antibiotics altogether — it's picking one with a good safety record for pregnancy specifically. Several antibiotic classes have long, reassuring safety histories in pregnancy, including penicillins (like amoxicillin) and cephalosporins (like cephalexin), which is part of why they're such common first-line choices for pregnancy-related infections like UTIs.

Other classes are typically avoided, especially in certain trimesters:

• Tetracyclines (doxycycline, minocycline, tetracycline) are generally avoided in pregnancy because they can affect fetal bone and tooth development.
• Fluoroquinolones (ciprofloxacin, levofloxacin) are generally avoided due to potential effects on developing cartilage, based on animal studies, though this class is sometimes still used when benefits clearly outweigh risk and no alternative exists.
• Some antibiotics are fine later in pregnancy but avoided closer to delivery, or vice versa, based on more nuanced trimester-specific data.

Breastfeeding is generally more permissive than pregnancy — most antibiotics considered safe for infants directly (like amoxicillin) pass into breast milk in only small amounts and are considered compatible with breastfeeding, though a few (again, tetracyclines in particular, and a small number of others) still warrant caution or an alternative.

Because the right answer depends on the specific antibiotic, the trimester, and your individual situation, this is one of the clearest cases where "ask your prescriber and pharmacist directly" isn't a cop-out — it's genuinely the only way to get a reliable answer, and resources like LactMed (a free NIH database) can help your care team check specifics for breastfeeding.