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  • 1
    ISSN: 1432-1041
    Keywords: omeprazole ; pepsinogen A ; pepsinogen C ; fasting serum gastrin ; pentagastrin ; gastric-acid ; healthy volunteers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary A study has been done in 10 male healthy volunteers of the effect of oral omeprazole 20 mg daily for 3 days on the serum concentrations of Pepsinogens A and C in relation to changes in fasting serum gastrin and basal and pentagastrin stimulated gastric acid output. The concentrations of Pepsinogens A and C showed concomitant and variable but significant increases, and the Pepsinogen A, C ratio did not change during the 3-day course of omeprazole. The increments were also significantly correlated with the increase in fasting serum gastrin and with the reduction in pentagastrin stimulated acid output. The correlations were mainly due to the marked inhibition of gastric acid secretion and the corresponding increases in serum gastrin and Pepsinogens A and C in two subjects, as in the other 8 subjects the changes were only modest. There appears to be a relationship, therefore, between the degree of inhibition of acid by omeprazole and the parallel increases in both serum pepsinogens and fasting gastrin.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1041
    Keywords: Nifedipine ; omeprazole ; absorption ; gastric pH ; pharmacokinetic ; drug interaction ; adverse effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The effects of single dose (20 mg) and short-term (20 mg/day for 8 days) oral treatment with omeprazole on the pharmacokinetics and effects of oral nifedipine (10 mg capsule) and on gastric pH have been investigated in a randomized, double-blind, placebo-controlled cross-over study in 10 non-smoking healthy male subjects. The single dose of omeprazole had no significant effect on any pharmacokinetic parameter of nifedipine, nor on gastric pH, or blood pressure or heart rate. Short-term omeprazole treatment increased the AUC of nifedipine by 26% (95% confidence interval 9–46%), but all other pharmacokinetic parameters of nifedipine, including elimination half-life, Cmax, tmax, and recovery of the main urinary metabolite, were not significantly changed. The median gastric pH during the absorption phase of nifedipine was increased by short-term omeprazole (pH 4.2) compared to placebo treatment (pH 1.4). Blood pressure and heart rate did not differ between treatments. The interaction between nifedipine and omeprazole is not likely to be of major clinical relevance.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-2568
    Keywords: prostaglandin E2 analog ; enprostil ; omeprazole ; gastrin ; pepsinogen A ; pepsinogen C
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract This study was undertaken to determine whether the synthetic prostaglandin E2 analog enprostil is able to inhibit basal and postprandial hypergastrinemia induced by omeprazole. We also studied the effect of omeprazole, enprostil, and the combination of both drugs on serum pepsinogen A and C levels. Eight normal subjects received in random order five-day courses of 40 mg omeprazole once a day, 35 µg enprostil three times a day, the combination of both drugs, and placebo. Omeprazole induced significant increases in basal and postprandial serum gastrin and in pepsinogen A and C levels. These increments persisted on the day after stopping treatment. Coadministration of enprostil inhibited omeprazole-induced basal hypergastrinemia and postprandial integrated serum gastrin, but not basal serum pepsinogen A and C, while the inhibition on the day after the treatment courses only reached statistical significance for the postprandial integrated serum gastrin concentration. It is concluded that enprostil inhibits omeprazole-induced basal and postprandial hypergastrinemia, with a tendency to protracted inhibition after stopping the drugs, and that enprostil does not significantly influence omeprazole-induced increases in pepsinogen A and C level. Coadministration of enprostil may be helpful in preventing pronounced hypergastrinemia in the few patients who show large serum gastrin increases during treatment with omeprazole.
    Type of Medium: Electronic Resource
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