My physician is a cardiologist. Not sure if he is a HCM specialist. The Losartan was prescribed for hypertension, which had been determined as the likely cause of my cardiomyopathy. The metoprolol alone had not sufficiently controlled my blood pressure. Two years after taking Losartan, my blood pressure began to rise again. A person on this blog suggested adding supplements in lieu of increasing my Losartan dosage. The one which has helped a great deal is Hawthorn Berry. In my case, it has been of enormous help.