Zifi and Zifi O are different medicines. Zifi contains only cefixime, while Zifi O is a combination of cefixime and ofloxacin. During pregnancy, especially at 35 weeks, antibiotics should not be taken without a doctor's prescription, as many coughs and sore throats are viral and do not require antibiotics. You should consult your doctor to confirm the cause and get a pregnancy-appropriate treatment.