I was discharged in 4 days and had a very easy quick recovery. My doctor prescribed another PT, urine specimin, and complete blood count. By the way, I stopped the Atenolol. Dear Robert, It is possible for jumps in the INR to occur and this is why careful monitoring is important. Common foods such as grapefruit juice, leafy green vegetables and many drugs can also change coumadin levels.
Smoking also changes drug levels.
The following is information on warfarin and it's drug interactions. Common reasons for coumadin use are in atrial fibrillation to reduce the risk of stroke, in persons with clotting disorders, in persons with mechanical heart valves, and sometimes in people with severe heart failure. The usual dosage is somewhere between 1 and 15 mg a day. See complete list below. Usually this is checked more often at the onset of taking the drug and less often once a steady state has been reached.