Like any other medicine, Plavix poses some risks, which you should know about. By understanding how they arise you will be able to avoid them or detect them early if they happen. Because Plavix reduces the ability of the body to form blood clots, a patient on Plavix will bleed longer after an injury than a patient who is not on Plavix. Longer bleeding can result in excessive loss of blood if that person is involved in an accident. Severe blood loss can be fatal.