Final answer:
Histamine2 receptor antagonists include Ranitidine, Famotidine, and Cimetidine, used to treat stomach acid-related conditions such as GERD and peptic ulcers.
Step-by-step explanation:
Drugs classified as histamine2 receptor antagonists include Ranitidine (Zantac), Famotidine (Pepcid AC), and Cimetidine (Tagamet). These medications are used to decrease the amount of acid produced in the stomach, thereby treating conditions such as ulcers, gastroesophageal reflux disease (GERD), and Zollinger-Ellison syndrome.
These H2 blockers provide relief from symptoms of heartburn associated with acid indigestion and sour stomach. While some of these medications are available over the counter, prolonged use or management of chronic conditions should be done under the guidance of a healthcare professional to ensure safety and efficacy.