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Ball-and-stick model of cimetidine, the prototypical H 2 receptor antagonist. H 2 antagonists, sometimes referred to as H2RAs [1] and also called H 2 blockers, are a class of medications that block the action of histamine at the histamine H 2 receptors of the parietal cells in the stomach.
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 .
A study from 2019 showed that PPI use alone and together with histamine H2-receptor antagonists was associated with an increased bone fracture hazard, which was amplified by days of use and earlier initiation of therapy. [38] The reason is not clear; increased bone break down by osteoclasts has been suggested. [39]
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.
Common side effects include headache, abdominal pain, diarrhea or constipation, and dizziness. [4] Serious side effects may include pneumonia and seizures. [4] [5] Use in pregnancy appears safe but has not been well studied, while use during breastfeeding is not recommended. [1] Famotidine was patented in 1979 and came into medical use in 1985. [6]
beta-blockers, calcium channel blockers, and renin-angiotensin system-acting agents, which all help lower blood pressure. They also examined the combination use of these medications. They then ...
The United States Food and Drugs Administration is warning pet owners about a common medication given to pets to treat arthritis. The F.D.A. now says that the drug Librela may be associated with ...
Like other H 2 receptor antagonists, lafutidine acts by preventing the secretion of gastric acid. [3] It also activates calcitonin gene-related peptide, resulting in the stimulation of nitric oxide (NO) and regulation of gastric mucosal blood flow, increases somatostatin levels also resulting in less gastric acid secretion, causes the stomach lining to generate more mucin, inhibits neutrophil ...