He was negative for the flu, so Tamiflu was cancelled and instead was prescribed pilled potassium and a diuretic that stopped Potassium loss. Like you, I shrug because I do not know what to think when other physicians or health care providers bypass the original prescriber of the drugs, in this case his cardiologist. Logic tells me the cardiologist knows better. However, this nurse practitioner seemed unsatisfied with the results and was even consulting medicine books, she seemed more “hungry” to change things instead of becoming complacent.