Loop diuretics are the most potent diuretics as they increase the elimination of sodium and chloride by primarily preventing reabsorption of sodium and chloride. The high efficacy of loop diuretics is due to the unique site of action involving the loop of Henle (a portion of the renal tubule) in the kidneys.
Ask your doctor if you should avoid or be cautious using diuretics if you:
- Have severe liver or kidney disease.
- Are dehydrated.
- Have an irregular heartbeat.
- Are in the third trimester of pregnancy and/or have developed high blood pressure during your pregnancy.
- Are age 65 or older.
- Have gout.
They can help keep blood pressure in check
The more potassium you consume, the more sodium that can exit your body, according to the American Heart Association. That's because the mineral acts like a natural diuretic.You'll often start with a thiazide diuretic:
- Chlorthalidone (Hygroton)
- Chlorothiazide (Diuril)
- Hydrochlorothiazide or HCTZ (Esidrix, Hydrodiuril, Microzide)
- Indapamide (Lozol)
- Metolazone (Mykrox, Zaroxolyn)
Diuretics. Water pills like hydrochlorothiazide and furosemide, used for high blood pressure and edema, can cause dehydration and can also lead to swelling and inflammation of the kidneys. The following tips can help prevent the risk of kidney damage.
Currently, hydrochlorothiazide is by far the most common kind of thiazide diuretic prescribed for high blood pressure. But some research suggests that chlorthalidone may be more effective at preventing heart attack and stroke.
Many patients are often surprised to find out they can actually drink too much water as they have been instructed that drinking lots of water is the key to staying healthy. Many patients take diuretics to help reduce fluid retention but it is still important to follow the fluid restriction recommended by the physician.
Diuretic therapy can be initiated, often alleviating the
edema. The most potent
diuretics are loop
diuretics, so-called because they work in the portion of the kidney tubules referred to as the loop of Henle.
Which diuretics treat edema?
- furosemide (Lasix),
- torsemide (Demadex),
- butethamine (Bumex),
- ethacrynate (Edecrin)
Side effects of thiazide diuretics are dose related and include:
- dizziness and lightheadedness,
- blurred vision,
- loss of appetite,
- itching,
- stomach upset,
- headache, and.
- weakness.
Among patients taking digoxin (Lanoxin), low levels of potassium caused by concurrent digoxin and diuretics (thiazide & loop diuretics) may cause weakness, cramps, and irregular heartbeats. Severe hyperkalemia may present as muscle weakness, fatigue and slow heart rate (bradycardia).
Description of the intervention
- Commonly used thiazide diuretics include chlorthalidone, hydrochlorothiazide, indapamide and metolazone.
- Bumetanide, furosemide and torsemide are frequently used loop diuretics.
- Frequently-administered potassium-sparing diuretics are triamterene, amiloride, spironolactone and eplerenone.
The three types of diuretic medications are called thiazide, loop, and potassium-sparing
diuretics. All of them make your body excrete more fluids as urine.
Potassium-sparing diuretics
- amiloride.
- triamterene (Dyrenium)
- spironolactone (Aldactone)
- eplerenone (Inspra)
There are several different classes of diuretics, including carbonic anhydrase inhibitors, loop diuretics, potassium-sparing diuretics, and thiazide diuretics. Each type works in a distinct way and in different parts of the kidney cell (called a nephron).
Diuretics are used to rid the body of extra fluid or salt. People with high blood pressure, heart failure, swollen tissues, and kidney disease often use diuretics to treat these conditions. Extra fluid in the body makes it hard for the heart to work properly and can make breathing difficult.
The more common side effects of diuretics include:
- too little potassium in the blood.
- too much potassium in the blood (for potassium-sparing diuretics)
- low sodium levels.
- headache.
- dizziness.
- thirst.
- increased blood sugar.
- muscle cramps.
One is to gradually reduce the dose to nothing. The other (and better way) is to place the patient on a low sodium diet so that only a small amount of sodium can be retained when diuretic treatment is stopped. Many patients are being unnecessarily treated with diuretics, which are not without adverse effects.
Diuretics are used to rid the body of extra fluid or salt. People with high blood pressure, heart failure, swollen tissues, and kidney disease often use diuretics to treat these conditions. Prescription diuretics are commonly called water pills, and their first effect is to increase urination.
Thiazide-type diuretics and beta-adrenergic blockers as first-line drug treatments for hypertension.
The blood pressure-lowering effect was modest. Thiazide diuretics reduced blood pressure by 9 points in the upper number (called systolic blood pressure) and 4 points in the lower number (called diastolic blood pressure).
Diuretics can also affect blood potassium levels. If you take a thiazide diuretic, your potassium level can drop too low (hypokalemia), which can cause life-threatening problems with your heartbeat. If you're on a potassium-sparing diuretic, you can have too much potassium in your blood.
The effect will last for about 6 hours so if you are taking the tablets twice a day make sure you take the last dose in the afternoon at least 8 hours before going to bed.
People who have diabetes may have increased blood sugar levels when taking thiazide diuretics. It is not recommended to use thiazide diuretics with dofetilide (Tikosyn), a drug used for treating abnormal heart rhythms, as this may increase the blood levels of dofetilide (Tikosyn) and cause abnormal heart rhythms.
More sodium is then excreted in the kidney with accompanying fluid. Pharmacological effects begin in about 2 hours after an oral dose, peaks in 4 hours, and lasts for about 6 to 12 hours. Hydrochlorothiazide is not metabolized, and a majority is excreted in the urine unchanged.
Notable alternatives to HCTZ include indapamide and chlorthalidone (CTD).
Be careful not to become overheated or dehydrated in hot weather while taking hydrochlorothiazide. Talk to your doctor about how much fluid you should be drinking; in some cases drinking too much fluid is just as harmful as not drinking enough fluids.
How do I take them? You usually take gentle, long acting diuretics by mouth once each day in the morning. The effects of bendroflumethiazide (bendrofluazide) start within 1-2 hours of taking and can make you pass more urine for the first 14 days when taking it.
Because loop and thiazide diuretics increase sodium delivery to the distal segment of the distal tubule, this increases potassium loss (potentially causing hypokalemia) because the increase in distal tubular sodium concentration stimulates the aldosterone-sensitive sodium pump to increase sodium reabsorption in
Thiazide diuretics control hypertension in part by inhibiting reabsorption of sodium (Na+) and chloride (Cl−) ions from the distal convoluted tubules in the kidneys by blocking the thiazide-sensitive Na+-Cl− symporter. Thiazide diuretics also increase calcium reabsorption at the distal tubule.
Bumex (bumetanide) is a loop diuretic (water pill) that prevents the body from absorbing too much salt, allowing the salt to instead be passed in the urine, used to treat fluid retention (edema) in people with high blood pressure, congestive heart failure, liver disease, or a kidney disorder such as nephrotic syndrome.
Thiazide-type diuretics include chlorothiazide, HCTZ, methychlothiazide, trichlormethiazide, polythiazide, bendroflumethiazide and thiazide-like diuretics include indapamide, CTDN, and metolazone.
Potassium-sparing diuretics are medicines that increase diuresis (urination) without the loss of potassium. They are generally weak diuretics and work by interfering with the sodium-potassium exchange in the distal convoluted tubule of the kidneys or as an antagonist at the aldosterone receptor.
Lozol (indapamide) is an oral antihypertensive/diuretic (water pill) used to treat fluid retention (edema) in people with congestive heart failure. Lozol is also used to treat high blood pressure (hypertension). Lozol is a discontinued brand name and is available as generic indapamide.
Mechanism of action
Thiazide diuretics control hypertension in part by inhibiting reabsorption of sodium (Na+) and chloride (Cl−) ions from the distal convoluted tubules in the kidneys by blocking the thiazide-sensitive Na+-Cl− symporter.Amiloride is a potassium-sparing diuretic (water pill) that prevents your body from absorbing too much salt and keeps your potassium levels from getting too low. Amiloride is used to treat or prevent hypokalemia (low potassium levels in the blood) in people with high blood pressure or congestive heart failure.
thiazide diuretic (THY-uh-zide DY-yoo-REH-tik) A type of drug used to treat high blood pressure, edema (extra fluid in the tissues), and other conditions. Thiazide diuretics cause the kidneys to make more urine, which allows the body to get rid of extra fluid and salt.
