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In: Diczfalusy, E., ed. Regulation of human fertility. (Proceedings of the WHO Symposium on Advances in Fertility Regulation, Moscow, USSR, November 16-19, 1976) Copenhagen, Denmark, Scriptor, 1977. p. 283-321This review of low-dose gestagen contraception emphasizes the variety of findings from different studies. For example, studies of chlormadinone acetate have found pregnancy rates of 1.1-12/100 woman-years. Results of trials of megestrol acetate suggested that a 500-mcg dose level yielded unacceptable pregnancy rates. No significant difference between various doses of norgestrel which have been studied were found (e.g., 50 and 75 mcg daily of dl-norgestrel or 30 mcg daily of the d-isomer). Pregnancy rate reported for most trials with this gestagen and also norethisterone and quingestanol were within an acceptable range. With 1 exception, pregnancy rates reported in trials of lynestrenol were remarkable low. Cumulative results of trials with various gestagens show Pearl Index rates between 2 and 3, except for lynestrenol. Dose level was the critical variable; i.e., it must be sufficiently high to exert antifertility action and low enough to avoid a high incidence of irregular bleeding. Apart from menstrual irregularities, other side effects from the minipill seem minor and in general less severe than those encountered with combined oral contraceptives.