Final answer:
Tagamet (cimetidine) and Zantac (ranitidine) are two examples of H2 histamine antagonist receptors. These drugs are used to reduce the production of gastric acid and treat conditions such as peptic ulcers and acid reflux.
Step-by-step explanation:
The two examples of H2 histamine antagonist receptors are Tagamet (cimetidine) and Zantac (ranitidine). These medications belong to a class of drugs known as H2 blockers, which bind to histamine H2 receptors in the stomach and reduce the production of gastric acid. Tagamet and Zantac are commonly used to treat conditions such as peptic ulcers and acid reflux.