A diuretic (water tablet), commonly furosemide, can increase urine output. But it is not prescribed to reduce creatinine clearance. A lower creatinine clearance means worse kidney filtration.

Diuretics are used for fluid overload from conditions such as heart failure, kidney disease, liver disease, or leg/lung swelling. They can sometimes raise blood creatinine temporarily if they cause dehydration or lower kidney blood flow, so kidney function and electrolytes need monitoring. Diuretics increase urine volume but do not restore kidney function. Brenner and Rector's The Kidney states that increased urine output with diuretics does not demonstrate improved kidney recovery.

Do not self-start a water tablet if you have low urine output, high creatinine, vomiting/diarrhea, dizziness, very low blood pressure, or kidney disease. A clinician should identify the cause first and check creatinine/eGFR, potassium, sodium, and fluid status.

There is no single medicine that safely “reduces creatinine”. Creatinine falls when the underlying cause of reduced kidney filtration is treated.

Examples:

Do not take furosemide or other water tablets just to lower creatinine. They may increase urine but can worsen creatinine if you become dehydrated. A recent Cochrane review found diuretics do not treat kidney injury itself (review PMID 39878152).

Seek urgent care today if urine is very low or stopped, there is leg/face swelling or breathlessness, confusion, persistent vomiting, severe weakness, or chest pain.

Share the creatinine value, eGFR, age, current medicines, urine output, and reason for the blood test for more specific guidance.

No, not directly. Furosemide increases urine output and removes excess fluid. It does not heal the kidneys or reliably lower creatinine.

It may be useful if high creatinine occurs with fluid overload such as leg swelling, lung congestion, or heart failure. As excess fluid and the underlying problem improve, creatinine may sometimes improve too. But if furosemide causes dehydration, low blood pressure, or excessive salt loss, creatinine can rise further.

KDIGO guidance advises against using diuretics to treat acute kidney injury itself, except to manage volume overload (KDIGO AKI guideline). A recent Cochrane review also assessed diuretics for AKI (PMID 39878152).

Use furosemide only when prescribed, with monitoring of:

Urgently seek care for markedly reduced urine, worsening breathlessness/swelling, severe dizziness, confusion, or persistent vomiting.