What should you know about antibacterial medicine for UTI?

A UTI can involve the urethra, bladder or kidneys. Antibiotics act against susceptible bacteria; they do not treat irritation from a non-bacterial cause. A clinician may diagnose a straightforward lower UTI from the symptom pattern, while a urine test can help when the diagnosis is uncertain, the infection may be complicated, or symptoms return.

The choice of medicine is individual. Allergies, kidney function, pregnancy, age, previous antibiotic use and earlier urine culture results can change which option is suitable. If a culture shows that the bacteria resist the first medicine, the prescription may need to be changed.

Take the antibiotic exactly as prescribed and follow the label instructions about timing, food and missed doses. Do not share it, use someone else’s prescription or save leftovers for another illness. Drink enough fluid to avoid dehydration unless a clinician has restricted your fluid intake.

Nausea, diarrhoea, rash or a yeast infection can occur with some antibiotics. Contact the prescriber or pharmacist if a side effect concerns you. Seek emergency help for trouble breathing, swelling of the lips, tongue or throat, faintness, or a rapidly spreading rash.

Get urgent medical assessment if urinary symptoms occur with fever, shivering, pain in the back or side, repeated vomiting, confusion, marked drowsiness or feeling severely unwell. These features can signal kidney involvement or a more serious infection and should not be managed by taking leftover antibiotics.

Contact a healthcare professional promptly if symptoms worsen after treatment starts, fail to begin improving within a few days, or return after the course. Earlier assessment is also sensible during pregnancy, for a child, or if you have kidney disease, a urinary catheter, reduced immunity or a known urinary tract abnormality.

Ask what makes a bacterial UTI likely, whether a urine sample is needed, how to take the medicine, which side effects require help, and what to do if a dose is missed. Mention medicine allergies, pregnancy or breastfeeding, kidney problems, other medicines and any antibiotics taken recently.