Variation in Bioavailability of Oral Methylergometrine in Healthy Male Volunteers
作者:
A.N.J.A. de Groot,
T.B. Vree,
Y.A. Hekster,
M. van den Biggelaar-Martea,
P.W.J. van Dongen,
J. van Roosmalen,
期刊:
Drug Investigation
(ADIS Available online 1994)
卷期:
Volume 8,
issue 6
页码: 345-351
ISSN:0114-2402
年代: 1994
出版商: ADIS
数据来源: ADIS
摘要:
The aim of this investigation was to assess the pharmacokinetics and bioavailability of methylergometrine in 6 healthy male volunteers after an oral dose of 0.125mg and after an intravenous dose of 0.200mg. A large variation in bioavailability of between 22 and 136% (mean value 84.9 ± 37.2%) was observed in the 6 volunteers. The lag time was also subject-dependent and ranged between 0.24 and 0.50 hours. After intravenous administration, the pharmacokinetic profile could be described with a 2-compartment model. The distribution half-life (t½&agr;) was 0.19 ± 0.27 hours, the elimination half-life (t½&bgr;) was 1.85 ± 0.28 hours, total body clearance (CL) amounted to 34.1 ± 9.7 L/h, and the steady-state volume of distribution (Vss) was 71.5 ± 25.9L. After oral administration, the pharmacokinetic profile could be described with a 1-compartment model. The absorption half-life (t½abs) was 0.08 ±0.08 hours, and the elimination half-life (t½&bgr;) was 2.08 ± 0.43 hours. This study with oral methylergometrine demonstrated such large interindividual variability in bioavailability that from a pharmacokinetic point of view the oral route of administration does not appear to be the most reliable way for accurate dosing in the prevention of postpartum haemorrhage.
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