The present invention relates to pharmaceutical compositions comprising a peptide that stimulates the release of gonadotropins and sexual steroids. More specifically, the present invention provides 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 vulcanization silicone elastomer or a rapid vulcanization silicone elastomer with a release modulator.
