Dear, it is simply
the force of habit. If dink water and then pass urine for a few days then it becomes habit what we call conditioned reflex. To come out of you have to reverse the process like pass urine first and then drink water. After resist the urge to pass urine however forceful or intenst it may be. After few fornight or so it would go away. No medications as it is not a disease. Dr. Kiran mehta.