cobicistat

noun

co·​bic·​i·​stat kō-ˈbik-i-ˌstat 

: a drug C₄₀H₅₃N₇O₅S₂ that is administered chiefly in conjunction with atazanavir or darunavir to inhibit breakdown and improve their effectiveness in the treatment of HIV infection

Note: Trademarks for preparations containing cobicistat include Evotaz, Prezcobix, Stribild, and Tybost.