If an antibiotic has been ineffective at treating my uti before, does that mean that it will continue to be ineffective for any future infections?

UTI: Not necessarily. A particular antibiotic is most effective against certain bacteria, not a certain person. If your next infection is caused by different bacteria, that first antibiotic might be the right one. Also, the effectiveness depends on using proper dosage and timing of doses. It can help to get sensitivity testing on the urine culture to guide choice of antibiotic.

Women who experience: recurrent UTIs often are reinfected with the same/similar organisms. One important question is whether the antibiotic which was ineffective was prescribed after a urine culture with antibiotic sensitivities was performed to identify which antibiotic(s) SHOULD BE effective. If not, no future antibiotics should be prescribed for future UTIs unless this testing is done identifying an effective drug.