Abstract
Two pharmacologically active metabolites, norethisterone (NET) and ethinylestradiol (EE 2), were detected by HPLC and HPLC-RIA methods in rabbit plasma following single i.v. and i.g. administration at a dose of 1 mg/20 μCi/kg of [ 3H]norethisterone-3-oxime (NETO). Approximately 48% (i.v. injection) and 91% (i.g. administration) of the NETO dose were hydrolyzed to NET. Although only 0.35% of the NETO dose was aromatized to EE 2, due to its high estrogenic potency, EE 2 might contribute to the overall pharmacological pattern of NETO in the rabbit.
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