Hello

An antibiotic which matches the sensitivity of the urine culture is best. Usually a broad spectrum antibiotic is started until the results are back and then changed. Hope he feels better

Antibiotics orally and increase hydration. Make sure he is urinating frequently. Cranapple and cranberry juice can acidify the urine and help prevent infections.

Your son needs antibiotics. Needs to to have urine tested type of bacteria causing UTI including antibiotic sensitivities before starting appropriate antibiotic. Should see a urologist. Most common cause for UTIs in boys is a non-retractile foreskin (called phimosis). Phimosis may require circumcision or treatment with steroid cream.