Hydrochlorothiazide and kidney stones: what to know

Hydrochlorothiazide changes how the kidneys handle sodium and calcium. In suitable cases, less calcium reaches the urine, which may reduce formation of some stones over time. It does not dissolve an existing obstructing stone or replace assessment of the stone’s size and position. The treatment choice depends on stone analysis, urine testing, kidney function and your wider health.

Use the prescribed dose and keep follow-up appointments for blood and urine checks. Drink the amount advised for you; vomiting, diarrhoea, intense heat and sweating can cause dehydration, while some heart or kidney conditions require an individual fluid plan. Keep a record of flank or abdominal pain, urine changes and any stone passed. Do not add supplements, change salt intake or stop the medicine without clinical advice.

Get urgent medical help for severe or worsening flank pain, fever with urinary symptoms, repeated vomiting, inability to pass urine, fainting or confusion. Painful urination, blood in urine or pain that does not settle warrants prompt assessment because a stone can obstruct flow or infection can occur behind an obstruction.

Ask which stone type is suspected, whether you need urine collection or imaging such as an abdominal ultrasound, how much fluid is appropriate, and which medicines may interact with hydrochlorothiazide.