Profile: Merck & Co. Inc is a pharmaceutical company that discovers, develops, manufactures & markets vaccines and medicines to address unmet medical needs. Our Zetia when administered alone or in combination with an HMG-COA reductase inhibitor is indicated as an adjunctive therapy to diet. Our RotaTeq is an oral vaccine used to help prevent rotavirus infection in children. Our COZAAR (losartan potassium tablet) and HYZAAR( losartan potassium hydrochlorothiazide tablet) are indicated for the treatment of hypertension. COZAAR may be used alone or in combination with other antihypertensive agents, including diuretics.