Welcome to HCM,
You are diabetic and having UTI, we see many organisms are resistant to various antibiotics so use of such antibiotics which are effective commonly used after culture and sensitivity.
has toxicity mainly nephrotoxicity
to kidneys and ototoxicity
to ears if you have any issues with kidney or ears then you must discuss with treating physician to find any alternative antibiotic if possible, if it is absolutely necessary to use then dose may be reduced or dosing
interval may be increased.
has some side effect but if required used commonly if notice any symptoms, then you should report to your treating physician.