Losartas HT 50mg/12.5mg Tablets 30’s contains losartan 50mg and hydrochlorothiazide 12.5mg. This medicine treats high blood pressure. It works by blocking the hormone angiotensin hence helps in relaxing blood vessels. Also, the drug allows the blood to flow more smoothly and the heart to pump more efficiently. Hydrochlorothiazide removes extra water and certain electrolytes from the body.