A kit (kit-of-parts or set) in the form of a catheter system for medicinally and physically treating the prostate and optionally the bladder, preferentially in conjunction with or after a transurethral resection and/or vaporisation of the prostate, in conjunction with a benign hyperplasia of the prostate or in conjunction with or after a radiation therapy of a carcinoma of the prostate, wherein the kit comprises: • on the one hand a catheter in the form of an indwelling catheter, wherein the catheter comprises - a catheter tube, - a catheter connector disposed on the catheter tube and - a fillable and/or expandable prostate balloon, wherein the catheter tube has a distal end and a proximal end, wherein the catheter connector is disposed at the distal end, wherein a first duct reaching from the catheter connector to at least one discharge opening is provided in the region of the proximal end of the catheter tube, wherein the prostate balloon is disposed at the proximal end of the catheter tube, wherein a second duct reaching from the catheter connector to the prostate balloon is provided in the region of the proximal end of the catheter tube, wherein the prostate balloon has a wall that is permeable by means of pores, wherein the diameter of the pores is such that in the inserted state of the catheter a medicament can be selectively discharged through the wall, wherein the wall of the prostate balloon has a plurality of pores with a diameter in the range of from 1 to 100 μm in the expanded state, and wherein the pores are produced by laser perforation, and wherein means for positioning the proximal end are provided in the region of the proximal end of the catheter tube, wherein an expandable and/or fillable bladder balloon is provided as means for positioning the proximal end; and • on the other hand at least one application device containing at least one medicament for administering the medicament, in particular in the form of a preferentially sterile syringe, preferably a piston syringe, in particular for filling the catheter, in particular the prostate balloon, and as applicable the bladder balloon, with the medicament, wherein the medicament contains at least one pharmaceutical active substance, wherein the pharmaceutical active substance is selected from the group of antiphlogistics (anti inflammatories), anti-oedematous drugs and wound healing products and also mixtures and combinations thereof. • on the one hand a catheter in the form of an indwelling catheter, wherein the catheter comprises - a catheter tube, - a catheter connector disposed on the catheter tube and - a fillable and/or expandable prostate balloon, wherein the catheter tube has a distal end and a proximal end, wherein the catheter connector is disposed at the distal end, wherein a first duct reaching from the catheter connector to at least one discharge opening is provided in the region of the proximal end of the catheter tube, wherein the prostate balloon is disposed at the proximal end of the catheter tube, wherein a second duct reaching from the catheter connector to the prostate balloon is provided in the region of the proximal end of the catheter tube, wherein the prostate balloon has a wall that is permeable by means of pores, wherein the diameter of the pores is such that in the inserted state of the catheter a medicament can be selectively discharged through the wall, wherein the wall of the prostate balloon has a plurality of pores with a diameter in the range of from 1 to 100 μm in the expanded state, and wherein the pores are produced by laser perforation, and wherein means for positioning the proximal end are provided in the region of the proximal end of the catheter tube, wherein an expandable and/or fillable bladder balloon is provided as means for positioning the proximal end; and - a catheter tube, - a catheter connector disposed on the catheter tube and - a fillable and/or expandable prostate balloon, • on the other hand at least one application device containing at least one medicament for administering the medicament, in particular in the form of a preferentially sterile syringe, preferably a piston syringe, in particular for filling the catheter, in particular the prostate balloon, and as applicable the bladder balloon, with the medicament, wherein the medicament contains at least one pharmaceutical active substance, wherein the pharmaceutical active substance is selected from the group of antiphlogistics (anti inflammatories), anti-oedematous drugs and wound healing products and also mixtures and combinations thereof.