Do antibiotics treat VUR?

Antibiotic prophylaxis does not treat VUR, rather it is used to treat bacteria in the urine, UTIs, that can cause renal scarring

Some studies have shown that antibiotic prophylaxis may not prevent kidney scarring1, the primary goal of VUR treatment.

Although antibiotic prophylaxis may treat UTIs, antibiotic therapy has been shown to increase antibiotic resistance. Symptomatic UTI recurrence with resistant E. coli was significantly more likely to occur among those on Antibiotic prophylaxis (63%) compared with those on placebo (19%).1

References:
  1. The RIVUR Trial Investigators. Antimicrobial prophylaxis for children with vesicoureteral reflux. N Engl J Med. 2014;370:2367-2376.