 [ Symptoms ] how much water does it take to dilute urine i am worried i might have accidentally diluted a urine sample i consumed a a 500ml bottle of water 4 hours before the test and my urine was a bright yellow when i finally took the test it did not appear a dark yellow but it was a lighter yellow i also took a multivitamin that morning same time as the bottle of water could that mess up a urine drug test [ Disease ] you are correct levoquin is an antibiotic and antibiotics do not work for viruses the diagnosis of viral bronchitis is usually based solely on a clinical assumption since the medical provider probably did not perform a plethora of diagnostic tests that would confirm it in the outside chance that a viral bronchitis could progress to a secondary bacterial infection a clinician may still empirically prescribe an antibiotic since i do not know the details of the case or the medical history i cannot comment whether this antibiotic was warranted or not