You have asked a few different questions that are not necessarily related. Your INR test that keeps coming back low is due to a combination of incorrect dosing your warfarin medication (Coumadin), and your diet. People with mechanical heart valve replacements should have an INR at least above 2 depending on the type of valve that you received. If you eat a lot of foods that are high in vitamin K (such as green leafy vegetables), then your INR will be harder to increase with warfarin. This is something that can be challenging, but hopefully you and your doctors
will get right eventually. I don't think that your warfarin or INR has anything to do with your balance. Some seizure medications can have side effects such as loss of balance. There are many different types of seizure medications, so I can't tell you if yours is responsible. However, given the likely possibilities, I would say that a neurological cause is the most likely. Thus, I would suggest scheduling an appointment with your neurologist
. He or she can perform a neurological examination to tease out what could be causing your balance issues. Your neurologist will be able to tell if this could be a side effect of your anti-seizure medication. Good luck.