The present invention relates to pharmaceutical compositions comprising a peptide that stimulates the release of gonadotropins and sexual steroids. More specifically, the present invention proposes pharmaceutical compositions comprising kisspeptin, preferably in the kp-10 form, or derivatives thereof, for use in ovulation cycle inducing and/or infertility treatment programs. The formulations according to the present invention belong to two main groups: injectable solutions and implantable formulations. The injectable solutions according to the present invention can be divided into immediate release solutions and prolonged action solutions. The implantable formulations according to the present invention can be prepared using an RTV silicone elastomer, a rapid vulcanisation silicone elastomer or a rapid vulcanisation silicone elastomer with a release modulator.La presente invención trata de composiciones farmacéuticas, comprendiendo un péptido estimulador de la liberación de gonadotropinas y esteroides sexuales. Más específicamente, la presente invención propone composiciones farmacéuticas comprendiendo kisspeptina, preferentemente, la forma kp-10 o derivados, para el uso en programas de inducción de ciclicidad y/o tratamiento de infertilidad. Las composiciones de la presente invención están bajo la forma de formulaciones de libración prolongada.
