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The effect of rifampicin on norethisterone pharmacokinetics

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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.

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Authors and Affiliations

  1. Department of Pharmacology and Therapeutics, University of Liverpool, England

    D. J. Back, A. M. Breckenridge, Francesca Crawford, M. MacIver,  M. Orme, B. K. Park, P. H. Rowe & Eileen Smith

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  1. D. J. Back
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  2. A. M. Breckenridge
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  3. Francesca Crawford
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  4. M. MacIver
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  5. M. Orme
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  6. B. K. Park
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  7. P. H. Rowe
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  8. Eileen Smith
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Back, D.J., Breckenridge, A.M., Crawford, F. et al. The effect of rifampicin on norethisterone pharmacokinetics. Eur J Clin Pharmacol 15, 193–197 (1979). https://doi.org/10.1007/BF00563105

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  • DOI: https://doi.org/10.1007/BF00563105

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