Chlorthalidone is the guideline-recommended diuretic drug for lowering blood pressure.
But a recent study from Columbia University Irving Medical Center showed that this drug could cause more serious side effects than hydrochlorothiazide, a similarly effective diuretic drug.
The findings are against the current treatment guidelines recommending chlorthalidone over hydrochlorothiazide.
The study is published in JAMA Internal Medicine. The lead author is George Hripcsak, MD, MS.
In the study, the team looked at 17 years of data on more than 730,000 people treated for high blood pressure.
They found that chlorthalidone and hydrochlorothiazide were similarly effective in preventing a heart attack, hospitalization for heart failure, and stroke.
However, patients taking chlorthalidone had nearly three times the risk of developing dangerously low levels of potassium and a greater risk of other electrolyte imbalances and kidney problems compared with those taking hydrochlorothiazide.
The side effects can lead to abnormal heart rhythms; hyponatremia (low sodium), which can cause confusion, kidney failure, and type 2 diabetes.
The researchers found that 6.3% of patients treated with chlorthalidone experienced hypokalemia (low blood potassium), compared with 1.9% of patients who were treated with hydrochlorothiazide.
Hypokalemia rates remained higher for patients taking chlorthalidone even when given at a lower dose than hydrochlorothiazide.
The team says doctors prescribing chlorthalidone should monitor for certain side effects in their patients.
This study is not the first to find harmful side effects linked to chlorthalidone.
A previous observational study found that the drug was linked to more electrolyte imbalances than hydrochlorothiazide.
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