Diuretics, sometimes called water pills, help rid your body of salt (sodium) and water. They work by making your kidneys put more sodium into your urine. The sodium, in turn, takes water with it from your blood. That decreases the amount of fluid flowing through your blood vessels, which reduces pressure on the walls of your arteries.
Source: www.mayoclinic.org/diseases-conditions/high-blood-pressure/in-depth/diuretics/art-20048129
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