An antagonist is a character opposing the protagonist in literature. Antagonist may also refer to: Science and medicine Antagonist (muscle), a muscle type Receptor antagonist, a class of drugs that bind to but do not trigger a receptor Physiological antagonists, a drug that produces an opposite effect (without blocking the same receptor) Arts and entertainment Antagonist A.D., a New Zealand metalcore band Antagonist (band), metalcore band from Whittier, California Antagonist (album), the debut album of the German Metalcore band Maroon The Antagonists (Haggard novel), a 1964 novel by William Haggard The Antagonists (Gann novel), a 1971 novel by Ernest K. Gann Antagonist, a 2007 book in the Childe Cycle by Gordon R. Dickson and David W. Wixon The Antagonists (TV series), a 1991 American television series Other See also Inverse agonist (pharmacology) Agonist-Antagonist (pharmacology) O Antagonista Antagonism (disambiguation) Agonist (disambiguation) Protagonist (disambiguation)