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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. This decreases the production of stomach acid.
Normally, histamine acts on H 2 to stimulate acid secretion; drugs that inhibit H 2 signaling thus reduce the secretion of gastric acid. H 2-antihistamines are among first-line therapy to treat gastrointestinal conditions including peptic ulcers and gastroesophageal reflux disease. Some formulations are available over the counter.
Ranitidine has 10% of the affinity that cimetidine has to CYP450, so it causes fewer side effects, but other H 2 blockers famotidine and nizatidine have no CYP450 significant interactions. [ 131 ] Ranitidine was introduced in 1981, and was the world's biggest-selling prescription drug by 1987. [ 132 ]
Which prescription drugs are covered by the Medicare cap? The $2,000 cap includes all the prescriptions that are in a Medicare recipient's Plan D formulary, or a plan's list of covered drugs.
Prescription drug list prices in the United States continually are among the highest in the world. [1] [2] The high cost of prescription drugs became a major topic of discussion in the 21st century, leading up to the American health care reform debate of 2009, and received renewed attention in 2015.
H 2 -histamine receptor blockers should be taken 2 hours after taking itraconazole a or ketoconazole a to avoid a significant decrease in their absorption. H 2 -histamine receptor blockers can counteract the effects of pentagastrin a and histamine a on gastric acid-forming function, so use H 2 blockers within 24 hours prior to the test ...