Drinking large amounts of water does not lower creatinine.
Drinking a lot of water increases the volume of water in the blood, which may lead to some reduction in creatinine concentration, but this effect is minimal. Because, only a small amount of water ingested by a normal body enters into the bloodstream, which has a negligible effect on the whole blood volume, therefore, the effect of drinking a lot of water on creatinine concentration is quite weak.
If the blood creatinine increases due to kidney function impairment caused by certain diseases, it is almost impossible to reduce the blood creatinine by drinking more water. Creatinine in the blood can only be lowered by treating the disease and using drugs that promote creatinine excretion. And drinking more water will not only reduce creatinine, but may also aggravate renal insufficiency.
Therefore, if patients have elevated creatinine, they should go to the hospital in time to clarify the cause of the disease and have targeted treatment under the guidance of professional doctors.