Levofloxacin 500 mg belongs to the fluoroquinolone group of antibiotics, and in pregnancy, it is generally not considered a first-choice medicine unless there is a clear medical need. In the third trimester, it is usually avoided unless the doctor feels the infection is more serious and the benefits outweigh the risks. This is because safety data in pregnancy is limited, and doctors usually prefer safer alternatives that are better studied in pregnant women. If a doctor still prescribes it, it is usually because other safer antibiotics may not be suitable for the type of infection or the bacteria involved. In such cases, it should only be taken under strict medical supervision, with the correct dose and duration, and not self-started. It is also important to inform your doctor about any other medicines you are taking, allergies, or kidney issues before using it. If you are in your third trimester and suspect infection, it is always better to get evaluated first and confirm the need for antibiotics through proper tests, rather than using stronger antibiotics on your own.