Effect of single intravenous doses of histamine2-receptor antagonists on volume and pH of gastric acid secretions in critically ill patients

Keith M. Olsen, F. Charles Hiller, Bruce H. Ackerman, Kelly Crisp-Landwehr, Gerardo S. San Pedro

Research output: Contribution to journalArticle

4 Scopus citations


The effects of single doses of cimetidine, famotidine, and ranitidine on gastric acid and fluid secretions in 12 critically ill, mechanically ventilated patients were evaluated in a prospective, randomized, crossover, single-blind trial. Each patient received an intravenous dose of cimetidine 300 mg, famotidine 20 mg, or ranitidine 50 mg diluted in 50 mL of normal saline and infused over 30 minutes. Each agent was administered in crossover fashion on consecutive days after the pH returned to baseline. Analysis of gastric fluids and pH measurements were determined from gastric samples collected every 15 minutes. Cimetidine, famotidine, and ranitidine treatment resulted in significant increases in gastric pH and decreased fluid production and total aspirated fluid volume. Famotidine maintained a gastric pH ≥4.0 for a mean duration of 16.5 ± 4.1 hours, significantly longer (P < 0.01) than cimetidine (2.3 ± 1.3 hours) or ranitidine (4.9 ± 0.8 hours). The percent of pH readings ≥4.0 was significantly (P < 0.01) greater for famotidine (88.0%) compared with cimetidine (38.5%) and ranitidine (55.6%). In critically ill patients given a single intravenous dose, famotidine suppressed acid secretion to a greater degree and for longer time periods than with either cimetidine or ranitidine.

Original languageEnglish (US)
Pages (from-to)756-768
Number of pages13
JournalCurrent Therapeutic Research
Issue number8
StatePublished - Aug 1995

ASJC Scopus subject areas

  • Pharmacology
  • Pharmacology (medical)

Fingerprint Dive into the research topics of 'Effect of single intravenous doses of histamine<sub>2</sub>-receptor antagonists on volume and pH of gastric acid secretions in critically ill patients'. Together they form a unique fingerprint.

  • Cite this