Warfarin is not for an irregular heart beat, it is to prevent blood clots and stop him having a stroke, pulmonary embolism, heart attack or DVT. He has probably had at least one of these in the past. The drugs most often prescribed for irregular heartbeats are the beta-blockers, also used to control hypertension , like atenolol, propranolol, and anything else ending in olol. It is important for regular blood checks if you are taking warfarin as it can cause haemorrhages and is very dangerous in overdosage, being primarily rat poison (makes them bleed to death).
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