The story
From (sul)famo(yl) + -tidine (“cimetidine derivative”).
Etymology from Wiktionary, CC BY-SA 4.0.
famotidine
Today it means: An H₂ antagonist C₈H₁₅N₇O₂S₃ (trademark Pepcid) used to inhibit gastric acid secretion especially in the short-term treatment of gastric and duodenal ulcers and gastroesophageal reflux disease and in the treatment of disorders (as Zollinger–Ellison syndrome) involving gastric acid hypersecretion. Full definition →