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The H 2 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. H 2 antagonists are used in the treatment of dyspepsia , although they have been surpassed in popularity by the more effective [ 1 ] proton pump inhibitors .
Famotidine, sold under the brand name Pepcid among others, is a histamine H 2 receptor antagonist medication that decreases stomach acid production. [4] It is used to treat peptic ulcer disease , gastroesophageal reflux disease , and Zollinger–Ellison syndrome . [ 4 ]
Proton-pump inhibitors have largely superseded the H 2-receptor antagonists, a group of medications with similar effects but a different mode of action, and heavy use of antacids. [3] A potassium-competitive acid blocker (PCAB) revaprazan was marketed in Korea as an alternative to a PPI.
Omeprazole may be quantified in plasma or serum to monitor therapy or to confirm a diagnosis of poisoning in hospitalized patients. Plasma omeprazole concentrations are usually in a range of 0.2–1.2 mg/L in persons receiving the drug therapeutically by the oral route and 1–6 mg/L in people with acute overdose.
Most oral PPI preparations are enteric-coated, due to the rapid degradation of the drugs in the acidic conditions of the stomach. For example omeprazole is unstable in acid with a half-life of 2 min at pH 1–3, but is significantly more stable at pH 7 (half-life ca. 20 h).
Cimetidine was the prototypical histamine H 2 receptor antagonist from which later drugs were developed. Cimetidine was the culmination of a project at Smith, Kline & French (SK&F; now GlaxoSmithKline) by James W. Black, C. Robin Ganellin, and others to develop a histamine receptor antagonist that would suppress stomach acid secretion.
She is a co-author of a study published in 2024 that found unreliable pulse oximeter readings might limit the way Black patients with heart failure qualify for those potentially lifesaving procedures.
[1] [2] The GI cocktail is commonly prescribed in the hospital or emergency department, and has been used to help distinguish chest pain as either gastrointestinal or cardiac. [1] While it has been widely used in the treatment of dyspepsia, studies have suggested that the GI cocktail is only as effective as antacids alone.
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