what drugs are histimine h2 blockers?
<answer> The H2 receptor antagonists are a class of drugs used to block the action of histamine on parietal cells in the stomach, decreasing the production of acid by these cells. <context> The H2 receptor antagonists are a class of drugs used to block the action of histamine on parietal cells (specifically the histamine H2 receptors) in the stomach, decreasing the production of acid by these cells.he prototypical H 2 antagonist was cimetidine, developed by Sir James Black at Smith, Kline & French (now GlaxoSmithKline) in the mid-to-late 1960s and first marketed in 1976; sold under the trade name Tagamet, cimetidine would later become the first ever blockbuster drug.