Sodium phosphate nephropathy consists of damage to the kidneys caused by the use of laxatives containing sodium phosphate. Depending on the time of use of these drugs used for colonic preparation this disease can be acute or chronic. The acute condition can be cured with a suitable treatment, but the chronic condition can cause irreversible kidney damage.This case is about a patient who receives our services in the unit in Fundacion Cardio Infantil in Bogota, Colombia, with an acute kidney injurywith renal transplant being monitored. Sodium phosphate was used to be prepared the kidney for a colonoscopy.