Stricture in urethra, frequent urination

My close associate has an issue of frequent urination followed by low pressure of urine outflow .   Uroflow merry  test was done to analyse this .a couple of times, which indicates low urinary flow and also identified that urine retention in bladder.  Medication was given ..but there was no improvement.   Flowing which the urologist suggested RGU and MCU X -ray was done .which showed stricture in the urethra .  Now the urologist is suggesting that a procedure called VIU needs to be done. In case of reoccurrence then a urthroplasty is required. Kindly suggest if this is the way this case has to be handled or is there any other option to treat this with medication. Looking forward for your reply and suggestion