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  • 1
    Electronic Resource
    Electronic Resource
    The effect of hydralazine on steady-state plasma concentrations of metoprolol in pregnant hypertensive women (1988)
    Springer
    European journal of clinical pharmacology 35 (1988), S. 131-135 
    Details
    ISSN: 1432-1041
    Keywords: metoprolol ; hydralazine ; hypertension ; pregnancy ; pharmacokinetics ; drug interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary We have studied the plasma concentrations levels of metoprolol after its twice daily administration in a dose of 50 mg for 4 days in ten, hypertensive pregnant women to the during monotherapy and in combination with 25 mg of hydralazine given twice daily. Hydralazine increased the median AUC and Cmax of metoprolol by 38% and 88% respectively, and decreased the tmax from 1.5 h to 1.0 h. Hydralazine had no effect on the plasma concentrations of alpha-OH-metoprolol. These results suggest that the effect of hydralazine on metoprolol plasma concentrations is primarily due to a reduction in first-pass elimination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00609241
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Disposition of the adrenergic blocker metoprolol and its metabolite OH-metoprolol in maternal plasma, amniotic fluid and capillary blood of the neonate (1987)
    Springer
    European journal of clinical pharmacology 33 (1987), S. 363-368 
    Details
    ISSN: 1432-1041
    Keywords: metoprolol ; neonates ; amniotic fluid ; pharmacokinetics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Seven women were treated with metoprolol 50–100 mg twice daily for hypertension in pregnancy. The disposition of metoprolol and one of its metabolites alfa-OH-metoprolol was studied in venous plasma and amniotic fluid during labour, in mixed cord plasma and in capillary blood of the newborn. Peak concentrations of metoprolol and alfa-OH-metoprolol were reached 60 to 120 min after dosing in maternal plasma while the amniotic fluid levels of these compounds continued to increase from 60 to 180 min to the end of the study and were substantially higher than in the plasma after 4 to 5 h. It is postulated that a major fraction of metoprolol and alfa-OH-metoprolol reaches the amniotic fluid via the fetal urine and that the elimination from the amniotic fluid mainly proceeds via diffusion across fetal membranes and transfer across the fetal capillary bed. No measurable concentrations of metoprolol were found in two of the newborns 2 h after delivery. In the remaining four neonates the 2-h concentrations exceeded the corresponding cord plasma levels. In all neonates the alfa-OH-metoprolol levels in the capillary blood were higher 2 h after birth than in cord blood. In two newborns the metabolite levels continued to increase for 5 h and in one the highest blood concentrations of this metabolite was found 20 h after birth. Redistribution of metoprolol from tissue stores followed by metabolism might be the cause of these temporary elevations of the blood levels of metoprolol and alfa-OH-metoprolol.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00637631
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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