Medical Dictionary
Medical Definition of H2 antagonist
: a drug (as cimetidine, famotidine, nizatidine, or ranitidine) that reduces or inhibits the secretion of gastric acid by binding competitively with histamine to H2 receptors on cell membranes
Explore M-W
Seen and Heard
What made you want to look up H2 antagonist? Please tell us where you read or heard it (including the quote, if possible).
Writing? Check your grammar now!