I went to the doctor last week with lower backpains and a tingling sensation when I urinated. I was diagnosed with a prostate infection and given Ciprofloxacin (500mg) for 10 days. I finished the medicine yesterday. The tingling went away and the pains lessened. This morning, my partner and I had sex, I ejaculated, and everything felt fine except that my scrotum was a bit sensitive, but not unbearable. I proceeded to urinate just fine, then there was a blockage in my stream. I felt something being forced out of my penis, thinking it was left-over semen, but then checked the toilet and found a thick, small dark red blood clot. No pain before, during, or after, and my urine is running clear, but needless to say...I'm freaked out! Was it the last of my infection getting out, or should my partner and I be concerned?