How do you manage your bladder?
Are you actually getting UTIs (fever, chills, AD, malaise, etc.) or just having positive cultures (colonization)?
Prophylactic antibiotics don't prevent UTI in people with SCI, and they will significantly increase your risks for developing resistant strains fo bacteria chronically in your urine.
Do you have a decent urologist who really knows SCI?
Do you get regular screening for stones and other potential problems (at least annually)?
More information would help us guide you better.