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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 15 (1979), S. 193-197 
    ISSN: 1432-1041
    Keywords: norethisterone ; rifampicin ; enzyme induction ; antipyrine ; 6 beta-hydroxycortisol ; gamma-glutamyltranspeptidase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The pharmacokinetics of norethisterone have been studied in 8 women during and one month after treatment with rifampicin (450–600 mg/day). Rifampicin caused a significant reduction in the A. U. C. of a single dose of 1 mg norethisterone from 37.8±13.1 to 21.9±5.9 ng/ml X h (p〈0.01). The plasma norethisterone half life (β-phase) was also reduced from 6.2±1.7 to 3.2±1.0 h (p〈0.0025). In one additional woman on long term oral contraceptive therapy the 12 hour plasma norethisterone concentration was reduced by rifampicin from 12.3 ng/ml to 2.3 ng/ml. Rifampicin caused a significant increase in antipyrine clearance, 6β-hydroxycortisol excretion and plasma gamma-glutamyltranspeptidase activity but there were no significant correlations between changes in these indices of liver microsomal enzyme induction. There was a significant correlation between the percentage increase in antipyrine clearance and the percentage decrease in norethisterone A. U. C. during rifampicin. The changes in norethisterone pharmacokinetics during rifampicin therapy are compatible with the known enzyme inducing effect of rifampicin.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    European journal of clinical pharmacology 10 (1976), S. 89-95 
    ISSN: 1432-1041
    Keywords: Adrenergic beta receptor blockade ; drug plasma concentrations ; plasma renin activity ; essential hypertension
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The kinetics of alprenolol, in relation to its effect on blood pressure and plasma renin activity, have been studied in sixteen patients. A within-patient comparison was made between therapy for six weeks with placebo or alprenolol 200 mg thrice daily. Thirteen patients responded to alprenolol by a significant fall in blood pressure. In three other patients treatment did not lower blood pressure. In the group as a whole there was no significant correlation between the fall in systolic, diastolic or mean blood pressure, and the steady-state plasma alprenolol concentration, renin status, or degree of beta blockade. However, the thirteen responsive patients showed a significant relationship (p〈0.05 – 0.001) between the log mean steady-state plasma alprenolol concentration and the hypotensive response.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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