Hello - thanks for asking your question.
Generally using two antibiotics in combination should not be more effective. If the bacteria is sensitive to each of the antibiotics, using both of them together should not be more effective than using each one of them alone.
Using a drug interaction database, there should be no direct interaction between Bactrim and Cipro. Each has GI side effects, so there may be an increase probability of side effects such as upset stomach, nausea or diarrhea.
Typically with chronic prostatitis you have to make sure that the bacteria is sensitive to the antibiotic. This should be done with prostatic secretions before and after prostatic message. Treatment is typically 4-12 weeks.
Followup with your personal physician is essential.
This answer is not intended as and does not substitute for medical advice - the information presented is for patient education only. Please see your personal physician for further evaluation of your individual case.
Thanks,
Kevin, M.D.
On a side note, I know a patient who has actually been on cipro everyday for the last 1 year for his prostatitis. I wouldn't prefer the use of antibiotics so liberally, but that is the only thing he has found to work.