Do you see a HCM specialist? Losartan is not a medication that is commonly used in HCM. Many people take Toprol (I take the same amount you do) but the Losartan is unusual and unless prescribed by a doctor with a specialty in HCM, I would wonder about taking it. I travel to Mayo Clinic from California to see a top HCM specialist due to their familiarity with the disease. Many if not most cardiologists are not that well versed in the treatment of HCM.