UTI antibiotics: what to know

Antibiotics target bacteria that can cause urinary infections, but urinary burning or frequency can have other causes. A clinician may use your symptoms and a urine test to decide whether treatment is appropriate. The medicine selected can depend on where the infection is suspected, previous treatment, allergies, and other health conditions.

Symptoms should be monitored after treatment begins. Nausea, loose stools, or mild stomach discomfort can occur with some antibiotics. A rash, swelling of the lips or face, wheezing, or difficulty breathing needs urgent help because it may be an allergic reaction.

Take the medicine exactly as prescribed and follow its instructions about food, fluids, and timing. Do not use someone else’s tablets, save unfinished medicine for another episode, or share your prescription. Tell the prescriber about every medicine and supplement you use, including allergy history and previous antibiotic problems.

If a dose is missed, follow the label or ask a pharmacist rather than doubling the next dose. Keep drinking normally unless a clinician has advised fluid restriction. If symptoms do not begin to improve or return after treatment, arrange a review instead of repeating antibiotics yourself.

Get urgent help for fever with shaking chills, pain in the back or side, repeated vomiting, confusion, faintness, or difficulty passing urine. Contact the prescriber promptly for a new rash, severe diarrhoea, worsening pain, or symptoms that continue despite treatment. A clinician may need to check whether the infection is higher in the urinary tract or whether another condition, such as chlamydia, is possible.

Ask whether you need a urine test, what improvement to expect, what to do if a dose is missed, which side effects matter, and whether your other medicines can interact with the antibiotic.