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Histamine 2-Receptor Antagonists Tachyphylaxis: A Scoping Review.

James H Clark1, Zilla Hussain2, Lee Akst1

  • 1Department of Otolaryngology-Head and Neck Surgery, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA.

The Laryngoscope
|December 29, 2025
PubMed
Summary
This summary is machine-generated.

Histamine 2-receptor antagonists (H2RAs) lose efficacy quickly due to tachyphylaxis, with a significant reduction by day 3. This diminished effect, up to 27.5%, suggests H2RAs are not ideal for frequent GERD management.

Keywords:
GERDTachyphylaxishistamine 2‐receptor antagonists

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Area of Science:

  • Gastroenterology
  • Pharmacology
  • Clinical Medicine

Background:

  • Histamine 2-receptor antagonists (H2RAs) are commonly used for gastroesophageal reflux disease (GERD).
  • Tachyphylaxis, a rapid decrease in drug efficacy with repeated dosing, is frequently observed with H2RAs but poorly understood.
  • Understanding H2RA tachyphylaxis is crucial for optimizing GERD treatment strategies.

Purpose of the Study:

  • To conduct a scoping review on the decrease in H2RA efficacy with repeat dosing.
  • To investigate the mechanisms, impact, and management of H2RA tachyphylaxis.
  • To evaluate the clinical implications of H2RA tachyphylaxis in GERD management.

Main Methods:

  • Systematic literature search following PRISMA-ScR guidelines across major databases (PubMed, Embase, Scopus, Web of Science, Cochrane).
  • Data extraction by two independent reviewers focusing on mechanisms, impact, and management strategies.
  • Inclusion of studies investigating H2RA efficacy and tachyphylaxis in GERD patients.

Main Results:

  • H2RAs increase intragastric pH > 4 from 8% to 38% initially.
  • Tachyphylaxis begins by day 2, with efficacy reduced by 11.2% by day 3 and 20.3% by day 15.
  • Proton pump inhibitors (PPIs) maintain intragastric pH > 4 for 63% of the time without observed tachyphylaxis after 14 days.

Conclusions:

  • Tachyphylaxis is a well-documented phenomenon across all H2RAs, causing up to a 25% decrease in absolute efficacy.
  • The exact mechanisms driving H2RA tachyphylaxis remain unclear.
  • H2RAs should not be first-line treatments for frequent GERD or routinely added to proton pump inhibitor therapy.