Hello Doctor, my daughter, 18 yrs old is suffering from UTI, the symptom being severe flank pain. She has light fever too. She is drinking lots of water, hence no burning sensation during urination. But the flank pain is unbearable. The doctor has prescribed her Levofloxacin tablets 500 mg, 1/day. She was also treated for renal calculi a month ago. I hope she is not suffering from any severe kidney problems. Please suggest what to do. Thank you.