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A thiazide diuretic is a medicine that increases the kidneys' removal of sodium and water. It acts mainly in the distal convoluted tubule of the nephron. Thiazides are widely used to lower blood pressure and can also reduce selected forms of fluid retention. Examples include hydrochlorothiazide and chlorothiazide, while chlorthalidone and indapamide are commonly described as thiazide-like diuretics.
read more about thiazide diuretic ...Thiazide diuretics are commonly prescribed for high blood pressure, either alone or in a combination product. They can also treat mild edema associated with selected heart, liver, or kidney conditions. Because they reduce urinary calcium loss, they can help prevent recurrent calcium-containing kidney stones in selected patients. The medicine and dose depend on blood pressure goals, kidney function, electrolyte status, and other conditions.
Thiazides block the sodium-chloride cotransporter in the distal convoluted tubule. This reduces sodium reabsorption and increases excretion of sodium and water in urine. Their longer-term blood-pressure effect also involves reduced vascular resistance. Thiazides increase calcium reabsorption in the distal tubule, which lowers calcium excretion in urine.
Most thiazide and thiazide-like diuretics are taken by mouth once daily, although schedules vary by product and indication. Morning administration can reduce nighttime urination. Blood pressure, kidney function, sodium, potassium, calcium, and other laboratory values are checked according to clinical risk. The dose can require adjustment when dehydration, illness, interacting medicines, or kidney-function changes occur.
Thiazides can cause low sodium, low potassium, dehydration, dizziness, increased uric acid, higher blood glucose, and changes in calcium or magnesium. Severe electrolyte abnormalities can cause confusion, weakness, cramps, seizures, or abnormal heart rhythms. Gout, diabetes, kidney impairment, and use of lithium or other blood-pressure medicines can affect treatment safety. Patients should report severe weakness, fainting, confusion, or a marked change in urination.
Yes. Hydrochlorothiazide is one of the most commonly prescribed thiazide diuretics. It is used alone and in fixed-dose combinations with other blood-pressure medicines.
They can increase potassium loss and cause hypokalemia. Potassium monitoring and treatment decisions depend on the dose, other medicines, diet, and patient risk.
Yes, particularly after treatment begins or the dose increases. The noticeable diuretic effect can lessen over time even while the blood-pressure benefit continues.
They can raise uric acid levels and trigger gout in susceptible patients. A history of gout should be reviewed when selecting and monitoring treatment.
Thiazide Diuretics. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK532918/. Date Accessed August 6, 2026.
Hydrochlorothiazide. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK430766/. Date Accessed August 6, 2026.
Hydrochlorothiazide Tablets: Prescribing Information. DailyMed. https://dailymed.nlm.nih.gov/dailymed/lookup.cfm?setid=8c868894-667e-4a51-906a-838d63e420ba. Date Accessed August 6, 2026.
Chlorthalidone. StatPearls (NCBI Bookshelf). https://www.ncbi.nlm.nih.gov/books/NBK553174/. Date Accessed August 6, 2026.
Medical Management of Kidney Stones: AUA Guideline. American Urological Association. https://auau.auanet.org/sites/default/files/media/2022-02/06%20Kidney-Stones-Medica-Management-Guideline-JU%20%281%29.pdf. Date Accessed August 6, 2026.