terpin hydrate and codeine elixir /tur′pin/ , a preparation of the expectorant terpin hydrate, with sweet orange peel tincture, benzaldehyde, glycerin, alcohol, syrup, water, and the antitussive opiate codeine. Terpin hydrate diminishes secretions and promotes healing of the mucous membrane, and codeine depresses the cough center in the medulla oblongata. Prolonged use may lead to addiction.
