ranitidine

noun Pharmacology.

1. an antihistamine, C13H22N4O3S·HCl, that inhibits the formation of gastric acid, used in the treatment of peptic ulcers and gastroesophageal reflux disease.

n.

1. An antagonist for one of two types of histamine receptors occurring on the surfaces of cells, especially gastric cells, that acts by inhibiting gastric acid secretion and is used in the treatment of duodenal ulcers.