After using enhanced ct contrast, if there is no contraindication or relative contraindication, it is best to drink more water and go to the toilet more often so that the contrast agent can be metabolized from the kidneys as soon as possible, without any special emphasis on how much or how little water to drink specifically. Since the contrast agent will not be absorbed by the body and is mainly metabolized by the kidneys, drinking more water is conducive to the early discharge of the contrast agent. In general, the normal daily urine output of adults is about 1500ml, so it is recommended to drink as much water as possible to promote the excretion of the enhanced ct contrast medium after use. Now the clinical contrast agent has been improved and has less impact on the kidney, but if the patient has renal dysfunction, the contrast agent needs to be discharged as soon as possible to avoid aggravating the condition. Doctors suggest that generally the contrast agent can be discharged by drinking a lot of water for one day, or according to their own situation relative to drinking a lot of water for 3 to 4 days. Note: patients need to drink a lot of water slowly, prohibit a short period of time to drink a lot of water, so as not to cause water intoxication.