My son is 30 years old and in good health. He had shoulder surgery because of a car accident. A week later he had a blood clot in one of his lungs. He is now taking Coumadin because of that. The standard procedure for this medicine is to take it for 6 months and then the treatment is stopped. For someone that wants to return to their active life sooner... what are the risk, or how stupid would it be to stop taking the medicine after only 3 months?