A diuretic is any substance that promotes diuresis, the increased production of urine. This includes forced diuresis. There are several categories of diuretics. All diuretics increase the excretion of water from bodies, although each class does so in a distinct way
Diuretics reduce the amount of salt and water in the body. As the kidneys filter the excess water from the blood, the volume of blood the heart has to pump is reduced, causing blood pressure to go down.
Diuretics are given when the have congestive high blood pressure, swelling or water retention (edema) or heart failure. They may also be prescribed for certain kinds of kidney or liver disease. Diuretics can be very useful for people who are older or obese
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