The present invention relates to a composition for the administration of biologically active substances in a gynaecologic and rectal ambit, as well as the uses of said composition. Said composition presents particularly favourable technological and stability characteristics of the end product, above all with regard to the viscosity after the dissolution/resuspension of the same in a hydrophilic liquid medium which allows a better adhesion and a direct contact from bacteria to the treated mucosae. Said composition includes a specific viscosizing agent selected from the group of the gums, which can play an important prebiotic function by contributing in a significant way to the correct growth and colonization of the probiotic culture, thus forming a perfect symbiotic system.
