acepromazine

noun

ac·​e·​pro·​ma·​zine ˌa-sə-ˈprō-mə-ˌzēn 

: a phenothiazine tranquilizer with anti-nausea properties that is used in veterinary medicine and is administered orally or by injection in the form of its maleate C₁₉H₂₂N₂OS·C₄H₄O₄

Many pets are given stronger tranquilizers such as acepromazine when traveling longer distances or flying on an airplane.

—Tina Neel, The Oklahoman (Oklahoma City, Oklahoma)