Which of the following drugs are classified as histamine-2 receptor blockers?

Histamine-2 receptor blockers, also known as H2 antagonists, are a class of medications that reduce stomach acid production by blocking the action of histamine on H2 receptors in the gastric lining. Cimetidine and Ranitidine belong to this class and are commonly used to treat conditions such as gastroesophageal reflux disease (GERD), peptic ulcers, and other conditions associated with excessive stomach acid.

Cimetidine, marketed as Tagamet, was one of the first H2 blockers developed and has been widely used for its efficacy in reducing stomach acid. Ranitidine, known as Zantac, is another well-known H2 receptor antagonist that also works by inhibiting stomach acid production. Both of these medications directly target the H2 receptors, thereby effectively managing symptoms related to gastric acid secretion.

The other options listed include proton pump inhibitors, which work through a different mechanism by inhibiting the proton pump responsible for acid secretion. Albuterol and Fluticasone are entirely unrelated as they are bronchodilators and anti-inflammatory agents used mainly in the treatment of respiratory conditions. Therefore, the correct answer highlights the relevant drugs classified specifically as histamine-2 receptor blockers.