I was diagnosed with a UTI on Friday. I called the Dr. because of side effects of Levofloxacin and was told that my culture came back negative. ???? My symptoms of pain at urination and BM, low flow, back pain, and urine odor has subsided. It took a couple of days on the antibiotic. Yet, I continue to chill, have headaches, am tired and week and get exhausted easily. The primary side effect to the Levofloxacin in mainly pain in my Achilles tendons.