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Best Edema Diuretics: Loop vs. OsmoticIn This Article
Medications that help the body release water through increased urination are called diuretics. They are sometimes referred to as water pills. There are several types of diuretics including loop, potassium-sparing, thiazide, and osmotic. Below is an overview of loop diuretics and osmotic diuretics and a comparison of the two.
What are Loop Diuretics?Loop diuretics can be either administered via I.V. in a hospital setting or taken orally. They increase urine flow and remove water from the body better than any other diuretic. Because they are more powerful than thiazide diuretics, they are more effective in treating patients with impaired kidney function. How do Loop Diuretics work?These medications, act at the ascending Loop of Henle (a tiny, loop-like filtering tube in the kidney nephrons) which increases urine production. Specifically, loop diuretics prevent the reabsorption of sodium ions. This, in turn, increases electrolyte concentration in the fluid that passes through the nephron. Because this concentrated water cannot be put back into the bloodstream from the nephron, sodium reabsorption is inhibited. This causes water to be lost through increased urine volume and urination frequency. Uses of Loop DiureticsThese powerful medications are mainly used to treat edema (swelling) in hospital patients who suffer from congestive heart failure, liver disease, and kidney disease. Since loop diuretics reduce blood volume which also decreases blood pressure, they are sometimes used to treat hypertension (high blood pressure). This is especially true in patients with congestive heart failure. Here is a list of loop diuretics and their uses:
Risks and Side Effects of Loop DiureticsSome people may experience the following side effects when taking loop diuretics:
Additionally, some loop diuretics (furosemide, torsemide, and bumetanide) are sulfa drugs(sulfonamides). People who are sensitive to sulfa drugs may also be sensitive to these three medications.
What are Osmotic Diuretics?Osmotic diuretics are the least used type of diuretics. They work by increasing osmolality (the concentration of osmotically active particles in a solution). Osmotics reduce osmotic pressure in the blood and blood vessels. This inhibits, “the reabsorption of water and dissolved substances, and causes an increase in urine flow.” How does an Osmotic work?Osmotic diuretics expand the body's fluid and plasma volume which increases blood flow to the kidneys. They also inhibit the reabsorption of water and sodium and increase, the osmolarity of blood and renal filtrate. These diuretics draw fluid from the cells of the brain and eyes which reduces pressure on those parts of the body. They can also increase the elimination of renal toxins through the urine from drugs (both legal or illegal).
This class of diuretics is contraindicated for generalized edema (swelling). If used to treat edema, osmotic diuretics could make the swelling worse.
Risks and Side Effects of OsmoticsSome of the side effects of osmotic diuretics include:
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