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Pharmacokinetics of metoclopramide intravenously and orally determined by liquid chromatography.
Author(s) -
Graffner C,
Lagerstrom PO,
Lundborg P,
Ronn O
Publication year - 1979
Publication title -
british journal of clinical pharmacology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.216
H-Index - 146
eISSN - 1365-2125
pISSN - 0306-5251
DOI - 10.1111/j.1365-2125.1979.tb01028.x
Subject(s) - pharmacokinetics , metoclopramide , bioavailability , volume of distribution , urine , chemistry , chromatography , absorption (acoustics) , distribution (mathematics) , oral administration , half life , high performance liquid chromatography , pharmacology , anesthesia , medicine , mathematical analysis , biochemistry , physics , mathematics , acoustics , vomiting
1 A rapid and sensitive method, based on liquid chromatography, has been developed for determination of metoclopramide concentrations in plasma and urine samples. Concentrations down to 15 nmol/1 (5 ng/ml) of plasma and 100 nmol/1 (30 ng/ml) of urine could be determined with a relative standard deviation of less than or equal to 10%. The method was used to study disposition of metoclopramide in healthy volunteers following single doses intravenously and orally as aqueous solution and a slow release tablet. 2 The initial distribution after intravenous administration was very rapid. The elimination half‐life postdistribution was 4.9 h. The apparent volume of distribution, Vd, was 3.0 1/kg body weight. On average 19% was excreted unchanged after intravenous administration of 5 and 10 mg (15 and 30 mumol) of drug. The rate of absorption of metoclopramide was delayed after administration of a slow release tablet and the maximum plasma concentration was about 50% lower than after a solution. The extent of bioavailability was the same following the two different formulations suggesting a first‐pass elimination of 25‐40%.