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  • Title: Effects of an oral contraceptive on hepatic size and antipyrine metabolism in premenopausal women.
    Author: Homeida M, Halliwell M, Branch RA.
    Journal: Clin Pharmacol Ther; 1978 Aug; 24(2):228-32. PubMed ID: 679600.
    Abstract:
    Liver volume and antipyrine disposition have been investigated in healthy premenopausal women who received 30 microgram ethinyl oestradiol + 500 microgram dl-norgesterol as an oral contraceptive. Six months' treatment was associated with a 17% increase in liver volume while no change occurred in age-matched control subjects. In the same subjects the contraceptive decreased antipyrine clearance by 21%. Thus the contraceptive markedly reduced drug-metabolizing activity per unit volume of liver by 33%. In additional subjects, discontinuation of the contraceptive resulted in a 30% increase in antipyrine clearance. These observations confirm that conventional oral contraceptive therapy to premenopausal women increases hepatic size and that it is a potent inhibitor of drug-metabolizing activity.
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