Merck???s key products include Cozaar/Hyzarr, medicines for the treatment of hypertension;Gardasil, a vaccine for the prevention of cervical cancer and genital warts caused by certain types of HPV, Januvia, a medicine for the treatment of type 2 diabetes; Singulair, a once-a-day oral medicine for the treatment of asthma, allergic rhinitis and exercise-induced bronchoconstriction; Vytorin, a medici