Does Warfarin cause any serious male ejaculation delaying problems? I was on 12 mg with a blod clot and my ptinr was a 1.0 so the Dr. moved me to 20 mg a day. The last ptinr was 11.0 and the nurse called Friday evening telling me to back off to 12.5 mg. I have had sex with my wife 6 times and tried other ways but I can't ejaculate. My testicles just keep swelling larger and are tender. My anxiety level is high and blood pressure because this has me a nervous wreck. It is like "blue balls" x 10 that won't go away. Is this dangerous?