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H 2 antagonists can be used in the treatment of dyspepsia, peptic ulcers and gastroesophageal reflux disease. They have been surpassed by proton pump inhibitors (PPIs). The PPI omeprazole was found to be more effective at both healing and alleviating symptoms of ulcers and reflux oesophagitis than the H 2 blockers ranitidine and cimetidine. [2]
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 .
Sucralfate may be considered to have the advantage over H2-blockers and PPIs in this regard because sucralfate does not change the pH of gastric fluid. A majority of meta-analyses found that sucralfate therapy decreased the incidence of ventilator-associated pneumonia compared to H2-antagonists. [10]
Proton pump inhibitors are prodrugs and their actual inhibitory form is somewhat controversial. In acidic solution, the sulfenic acid is isolated before reaction with one or more cysteines accessible from the luminar surface of the enzyme, a tetracyclic sulfenamide. This is a planar molecule thus any enantiomer of a PPI loses stereospecifity ...
A newer PCAB vonoprazan with a faster and longer lasting action than revaprazan, and PPIs has been marketed in Japan (2013), Russia (2021), and the US (2023). [4] [5] [6] PPIs are among the most widely sold medications in the world. The class of proton-pump inhibitor medications is on the World Health Organization's List of Essential Medicines.
In 1972, functional antagonists to the H2 receptor emerged. This class of agents has since revolutionized the treatment of PUD, and its priority in the treatment of acid-related diseases has only been surpassed by the development of PPIs. Cimetidine, ranitidine, famotidine, and nizatidine are the four most commonly used H2-receptor antagonists ...
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There are no clinical trials to date that have studied the precise use of rabeprazole, or any PPI, for the treatment of acid-related complaints due to systemic mastocytosis, but acid suppressing medications such as PPIs and H2 receptor antagonists are routinely used to counter the histamine-mediated acid secretion found in this disorder. [14]
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