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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.
Proton-pump inhibitors have largely superseded the H 2-receptor antagonists, a group of medications with similar effects but a different mode of action, and heavy use of antacids.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.
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]
Antacids, H2 blockers (which work to reduce stomach acid), and proton pump inhibitors (PPIs) may provide relief from acid reflux symptoms. However, always consult a healthcare professional before ...
A derivative of timoprazole, omeprazole, was discovered in 1979, and was the first of a new class of drug that control acid secretion in the stomach, a proton pump inhibitor (PPI). [ 11 ] [ 12 ] Addition of 5-methoxy-substitution to the benzimidazole moiety of omeprazole was also made and gave the compound much more stability at neutral pH. [ 6 ]
With the development of proton pump inhibitors, such as omeprazole, approved for the same indications, cimetidine is available as an over-the-counter formulation to prevent heartburn or acid indigestion, along with the other H2-receptor antagonists. [12] Cimetidine was developed in 1971 and came into commercial use in 1977.
It is a proton pump inhibitor (PPI), used to treat peptic ulcer disease, gastroesophageal reflux disease, and Zollinger–Ellison syndrome. [5] Its effectiveness is similar to that of other PPIs. [6] It is taken by mouth. [4] Onset is over a few hours and effects last up to a couple of days. [4]
The proton-pump inhibitor Nexium by AstraZeneca is a me-too which was granted its patent by showing that it was effective for heartburn, not that it was better than its precursor, Prilosec. [10] It was shown to preserve revenues of Prilosec, whose U.S. patent expired in 2001.