I would like to know what alternative there is to bactrim. i have prostatitis bactria helped the best but made me to sick tryed cipro and doxycycline ?

Maybe no antibiotic: First have a frank conversation with your doctor about whether you need antibiotic treatment of any kind. Most prostatitis is non-infectious and antibiotics don't help. They're usually worth a try, but it's often best to stop after a couple of tries don't work and limit treatment to urine flow drugs, NSAIDs, etc. If documented bacterial infection, maybe consult with infectious disease specialist.