The liver will metabolize the toxins/medicines and the residues of medicines (if you are drinking urine) or the residue of residue of medicines (if drinking urine) or the residue of residue of residue of residue of medicines (if drinking urine)
Where does the liver throw it out ?
Through the bile (which has toxins in it) connected to the gall bladder (for storing bile) and the gall bladder pours the toxins into the food we eat during digestion ---- (through the bile duct if I remember my school biology well).
It is your liver which should get affected during urine therapy, definetely not your kidneys ---- research the questions "does the liver remove toxins through the bile" on the internet.
Urine therapy is stated to help all things except those requiring surgery.
But are you willing to do urine therapy, when all the doctors say that you'll result in kidney failure.
google "urine therapy" and "urine therapy testimonials" and see my articles in curezone.com "urine therapy support" group.