My fasting blood sugar started to rise about a week before I was diagnosed with a bacterial infection. I hadn't changed anything with diet or exercise so I didn't understand why my fasting readings were rising. Then I woke up in the night with fever and chills and that morning my blood sugar was way higher than typical and that day my post-meal blood sugar was also very elevated. I went to the doctor and sure enough tests confirmed a bacterial infection. I was put on an antibiotic (levofloxacin) and after a day my fasting blood sugar started to come down some. The course of antibiotics is for four weeks. My blood sugars have been behaving atypically with fasting blood sugars erratic but mostly higher then normal, but most after meal reading have been surprisingly lower than I would have expected. What experience have you had after the taking antibiotics? Do blood sugars quickly return to normal? Is it helpful to take pro-biotic and pre-biotic supplements to restore a healthy gut flora?