(medicine) something that treats or prevents or alleviates the symptoms of disease

a purgative made from the leaves of aloe

a purgative extracted from the seed of the castor-oil plant; used in paint and varnish as well as medically

(used with a singular noun) hydrated magnesium sulfate used as a laxative

a mild cathartic

purgative consisting of a milky white liquid suspension of magnesium hydroxide; used as a laxative and (in smaller doses) as an antacid