<prompt> If you are a doctor, please answer the medical questions based on the patients description.yes i have been taking this medicine jantoven since 2009 and this medicine is not working well with me my levels are always 1.02 to 1.06 i had a mitral valve replace a ticker and when i walk a good distant i get sick and vomits and sweat out of control  <response>: Hi, welcome to Chat Doctor. Thanks for writing to us. From the history it is evident THT you had a mitral valve replacement few years back, and now you are on CANTONWARFARIN SODIUM. You have also, mentioned your INR level between 1.02 to 1.06. As per the recommendation, the INR level in a post mitral valve replacement pt should lie between 2.5 to 3.5,low INR level signifies risk of :1. Bleeding from different sites such as gum, nose, per rectum etc2.fatigue, respiratory distress and dizziness.3.sweating, vomiting etc. so, as per the recommendation your dose of CANTON should be increased, so that the INR lies between 2.5 to 3.5,following that your problems will get automatically sorted out. Hope I have answered your query. Stay fit, good luck. 