I ve had risky sex 4 weeks ago. Next day I experienced bladder pain. Went to the doctor. He gave me tetracycline. Pain went away in a few days. Everything was fine until the 3rd week. Went to E.R. For rapid heartbeat, and dark urine. He gave me rocephrine, zythromax, and daily bactrim . I still have rapid heartbeat, hard to urinate. And was constipated for a couple days. Forced myself to stool. It was bright red.