Which medications in the drug class Histamine H2 Antagonists are used in the treatment of Pediatric Gastrointestinal Bleeding?

Updated: Dec 19, 2018
  • Author: Wayne Wolfram, MD, MPH; Chief Editor: Robert K Minkes, MD, PhD  more...
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Answer

Histamine H2 Antagonists

H2 blockers are reversible competitive blockers of histamine at H2 receptors, particularly those in the gastric parietal cells (where they inhibit acid secretion). The H2 antagonists are highly selective, they do not affect the H1 receptors, and they are not anticholinergic agents.

Some gastroenterologists recommend PPIs as being more effective than H2 blockers in promoting lesion cicatrization for hemorrhagic esophagitis and gastroesophageal reflux. Studies with omeprazole (Prilosec) and pantoprazole (Protonix) in intravenous (IV) forms have been encouraging, but they are not yet approved by the US Food and Drug Administration (FDA) for use in children.

Ranitidine (Zantac)

This agent inhibits histamine stimulation of H2 receptors in gastric parietal cells, which reduces gastric acid secretion, gastric volume, and hydrogen ion concentrations.

Famotidine (Pepcid)

Famotidine competitively inhibits histamine at the H2 receptors in gastric parietal cells, reducing gastric acid secretion, gastric volume, and hydrogen concentrations.

Nizatidine (Axid, Axid AR)

This agent competitively inhibits histamine at the H2 receptor of the gastric parietal cells, resulting in reduced gastric acid secretion, gastric volume, and hydrogen concentrations.

Cimetidine (Tagamet HB 200)

This agent inhibits histamine at H2 receptors of gastric parietal cells, which results in reduced gastric acid secretion, gastric volume, and hydrogen concentrations.


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