82993715_ines___UW_Health___Madison__WI_n_medicines_that_are_monitored_What_they_do
[Examples] Warfarin [Why monitor them] Things like an infection or a small change in your diet can change the way warfarin works. So can other medicines that you are taking. [Tests you may have] Prothrombin time (INR) [How often] As often as your doctor suggests [What they do] 
It helps prevent blood clots. Because it prevents clots, it also helps prevent heart attacks, strokes, and other problems caused by blood clots.
Monitoring Your Medicines | UW Health | Madison, WI