[Contraception by progestational agents administered in sequential form (author's transl)].

On the basis of a study involving 2338 months of treatment with progestational agents administered in sequential form from the 10th to the 25th day of the cycle, in women during the premenopausal period or suffering from benign or malignant breast pathology, the authors evaluated the contraceptive efficacy of this treatment. This efficacy was found to be good (Pearl index: 1 to 1,6%) with norsteroid progestational agents and inadequate with hydroxyprogesterone derivatives. It would thus appear possible to ensure coincidence of therapeutic action and contraception when norsteroids are used after the age of 40 (lower fertility) and/or when other methods are contraindicated.