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本研究比较孕二烯酮（ＧＳＤ）和左旋１８甲基炔诺酮（ＬＮＧ）的抗排卵作用。灌胃（ｉｇ）或皮下注射（ｓｃ）ＧＳＤ４及３ｍｇ／ｋｇ或ＬＮＧ４０ｍｇ／ｋｇ（ｓｃ）都可以完全抑制兔的排卵作用。经ｉｇ或ｓｃ两种药物对兔的抗排卵作用ＥＤ５０：ＧＳＤ分别为０．７９和０．６７ｍｇ／ｋｇ；而ＬＮＧ分别为２２．９和１６．１ｍｇ／ｋｇ。ＧＳＤ和ＬＮＧ对大鼠的抗排卵作用：ＧＳＤ７２（ｉｇ），４８ｍｇ／ｋｇ（ｓｃ）或ＬＮＧ４８０ｍｇ／ｋｇ（ｉｇ）都可以完全抑制大鼠排卵作用，以上剂量ＧＳＤ抑制排卵的ＥＤ５０分别为２４．０（ｉｇ）及１４．４ｍｇ／ｋｇ（ｓｃ）；ＬＮＧ为１９０ｍｇ／ｋｇ（ｉｇ）。ＧＳＤ和ＬＮＧ均有明显的孕激素活性，且ＧＳＤ比ＬＮＧ较强。ＧＳＤ无雌激素活性，但具有抗雌激素活性。ＧＳＤ的抗排卵作用较ＬＮＧ为强。
This study compared the anti-ovulation effects of gestodene (GSD) and levonorgestrel 18 (LNG). Ovulation of rabbits could be completely inhibited by intragastric (ig) or subcutaneous injection (sc) of GSD4 and 3 mg / kg or LNG 40 mg / kg (sc). The ig or sc on the anti-ovulation ED50: GSD were 0.79 and 0.67mg / kg; and LNG were 22.9 and 16.1mg / kg. The anti-ovulation effect of GSD and LNG in rats: GSD72 (48g / kg) or LNG80 (kg) all can completely inhibit the ovulation in rats, and the ED50 of GSD and ovulation inhibition were 24.0 (Ig) and 14.4 mg / kg (sc); LNG was 190 mg / kg (ig). Both GSD and LNG have obvious progestogen activity, and GSD is stronger than LNG. GSD has no estrogenic activity but antiestrogenic activity. The anti-ovulation effect of GSD is stronger than that of LNG.