Thank you for your query,
The citrobacter freundii is an opportunistic bacteria which may will cause urinary tract infection
in prone people.
With structural renal abnormalities ,there are chances of getting recurrent urinary tract infections.
As the urine culture showed the bacteria, the sensitivity of the organism to different antibiotics will be known by this report and your Doctor will advise you the specific antibiotic according to the report and clinical profile , so continue the medication as prescribed by your Doctor to treat the infection.
Be in regular follow up with your Doctor for any long term prophylactic antibiotic therapy, and to monitor the progression of hydronephrosis
Hope i have answered your query.