Kidney damage caused by drugs is also relatively common, such as some antibiotics such as gentamicin, which have clear nephrotoxicity and have the potential to cause decreased kidney function and kidney failure when used by the elderly or children, and some patients can develop uremia and even require dialysis treatment in advanced stages. Some chemotherapy drugs for tumors are also nephrotoxic and require close monitoring of kidney function. In addition, the iodine contrast agent used in cardiography or angiography is also prone to renal function damage because of its high viscosity and large molecular substances. Therefore, it is necessary to drink a lot of water after drug administration to activate the kidney function and reduce kidney damage.