Effect of omeprazole on plasma zinc levels after oral zinc administration

Indian J Gastroenterol. 2002 Nov-Dec;21(6):216-8.

Abstract

Background: The intestines are the major site of zinc absorption and excretion. Reduced gastric acid secretion and elevated gastric pH is an important factor affecting intestinal mineral absorption.

Methods: Gastric pH and volume, and basal and maximal acid outputs were measured in 14 healthy volunteers. Plasma zinc levels were then measured at baseline and 1, 2, 3 and 4 hours after oral administration of 300 mg zinc sulfate. The experiment was repeated after omeprazole administration (60 mg/day orally) for 7 days.

Results: Omeprazole administration significantly increased fasting gastric pH (5.5 versus 2.4; p < 0.001). Mean basal gastric acid output (1.6 vs 8.0 mEq/h; p < 0.001) and maximal acid output (20.6 vs 106.6 mEq/h; p < 0.001) decreased after omeprazole administration. Zinc absorption decreased after omeprazole administration (141 [34] mg/dL/h) compared with pre-omeprazole values (245 [35]; p < 0.01).

Conclusion: Suppression of gastric acid secretion by omeprazole reduces intestinal absorption of zinc.

MeSH terms

  • Achlorhydria / blood*
  • Achlorhydria / chemically induced
  • Administration, Oral
  • Adult
  • Area Under Curve
  • Female
  • Gastric Acid / chemistry
  • Gastric Acid / metabolism
  • Humans
  • Hydrogen-Ion Concentration
  • Intestinal Absorption / drug effects*
  • Male
  • Omeprazole / pharmacology*
  • Zinc / administration & dosage
  • Zinc / blood*
  • Zinc / metabolism

Substances

  • Zinc
  • Omeprazole