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Dydrogesterone: metabolism in man

P H van Amsterdam, H Overmars, P M Scherpenisse

    European Journal of Drug Metabolism and Pharmacokinetics
    |January 1, 1980
    PubMed
    Summary

    Dydrogesterone metabolism in women reveals stable 4,6-diene-3-one configuration. This metabolic stability may explain its oral effectiveness and lack of estrogenic properties compared to progesterone.

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    Area of Science:

    • Pharmacology
    • Metabolism Studies
    • Endocrinology

    Background:

    • Dydrogesterone is an oral progestational agent.
    • Understanding its metabolic fate is crucial for explaining its pharmacological profile.
    • Comparison with progesterone's oral effectiveness and estrogenic properties is of interest.

    Purpose of the Study:

    • To investigate the urinary metabolites of dydrogesterone in healthy women.
    • To identify the chemical structures of these metabolites.
    • To correlate metabolic stability with pharmacological activity.

    Main Methods:

    • Administration of 3H-labelled dydrogesterone to healthy women.
    • Collection and processing of urine from the first 8 hours post-administration.
    • Enzymatic hydrolysis of conjugated metabolites.
    • Isolation and identification of metabolites using extraction and chromatography techniques.

    Main Results:

    • 38% of administered radioactivity was recovered in urine within 8 hours.
    • 43 different chemical species were isolated.
    • Three major metabolites identified: 20 alpha-hydroxy-9 beta, 10 alpha-pregna-4, 6-diene-3-one (52%), 21-hydroxy-9 beta, 10 alpha-pregna-4, 6-diene-3, 20-dione (18%), and 16 alpha-hydroxy-9 beta, 10 alpha-4, 6-diene-3, 20-dione (1%).
    • The 4,6-diene-3-one configuration remained intact in identified metabolites.

    Conclusions:

    • The 9 beta, 10 alpha configuration renders the 4,6-diene-3-one structure metabolically stable.
    • This metabolic stability likely contributes to dydrogesterone's oral efficacy.
    • The findings suggest a mechanism for dydrogesterone's lack of estrogenic properties, differentiating it from progesterone.

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