###Human: What are the cause for blood in urine ###Assistant: Hello. A bladder infection (cystitis), stones and overdose of Coumadin (Warfarin), all three can be the likely reason for your bleeding. In case of any such bleeding, an ultrasound is a must. I prefer to start with a short course of antibiotics (mostly Nitrofurantoin and Cipro or Levofloxacin are given) for five days depending on sensitivity patterns. Blood clotting parameters need to be checked to see if you are on the overdose of Coumadin. Ultrasound is a must to rule out any other serious causes of bleeding like a tumor. Since antibiotics are not available over-the-counter in your place, you need to get back to your general physician. Moreover, even for getting an ultrasound and clotting parameters to check the overdose of Coumadin, you need the help of your general physician. Please do at the earliest.