title: Intravenous omeprazole: effect of a loading dose on 24-h intragastric pH.
abstract: To determine the effect of three times daily dosing with intravenous omeprazole on intragastric acidity, 24 h intragastric pH was measured continuously with a monocrystalline antimony electrode system in II patients with inactive duodenal ulceration during fasting conditions. After a baseline investigation, two different dosage regimens of intravenous omeprazole were compared in a double-blind crossover study, with regard to their ability to keep the pH greater than or equal to 4 for as long as possible. Success in the individual patient was defined as pH greater than or equal to 4 for at least 90% over the 24-h period. Two doses of omeprazole [40 mg t.d.s. (120 mg) and 80 mg + 40 mg + 40 mg (160 mg)] were compared. Omeprazole (120 mg) increased the median of individual median intragastric 24-h pH from 1.49 to 6.67. The pH was greater than or equal to 4 for greater than or equal to 90% of the 24 h in three of the 11 patients. With omeprazole, 160 mg (a loading dose of 80 mg), the median of individual median intragastric 24-h pH increased to 7.33. The pH was greater than or equal to 4 for greater than or equal to 90% of the 24 h in seven of the 11 patients. Median time to reach pH 4 was 39 min after 40 mg and 20 min after 80 mg omeprazole. An initial loading dose of 80 mg omeprazole seems preferable to 40 mg to achieve a fast and sustained increase in intragastric pH to above 4 in the fasting patient.
authors.affiliation: Department of Internal Medicine, University Hospital, Linköping, Sweden.
authors.forename: J
authors.initials: J
authors.lastname: Andersen
authors.forename: M
authors.initials: M
authors.lastname: Ström
authors.forename: J
authors.initials: J
authors.lastname: Naesdal
authors.forename: K
authors.initials: K
authors.lastname: Leire
authors.forename: A
authors.initials: A
authors.lastname: Walan
mesh_terms: D000328:Adult; D004311:Double-Blind Method; D005260:Female; D005744:Gastric Acid / Q000378:metabolism*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007275:Injections, Intravenous; D008297:Male; D008875:Middle Aged; D009853:Omeprazole / Q000008:administration & dosage / Q000627:therapeutic use*
chemical_list: D009853:Omeprazole