Diuretics for high blood pressure
Thiazide diuretics
Generic Name Brand Name chlorothiazide Diuril chlorthalidone and chlorthalidone combinations Clorpres, Tenoretic, Thalitone hydrochlorothiazide and hydrochlorothiazide combinations Capozide, Dyazide, Hyzaar, Lopressor HCT, Maxzide indapamide
Loop diuretics
Loop diuretics are prescribed for people who also have heart failure, kidney problems, or swelling in their legs (edema). But they are rarely prescribed for people who have high blood pressure alone. Loop diuretics quickly increase urine output for a few hours.
Generic Name Brand Name bumetanide Bumex furosemide Lasix torsemide Demadex
Potassium-sparing diuretics
Potassium-sparing diuretics, unlike most other diuretics, do not cause potassium levels to drop. Rather, they may lead to high potassium levels.
Generic Name Brand Name amiloride and amiloride combinations spironolactone and spironolactone combinations Aldactazide, Aldactone triamterene and triamterene combinations Dyazide, Maxzide
Other
Generic Name Brand Name metolazone Zaroxolyn How It Works
Diuretics cause the kidneys to remove more sodium and water from the body which helps to relax the blood vessel walls, thereby lowering blood pressure.
Diuretics often are combined with other high blood pressure medicines. Some of the brand names listed here are a combination of a diuretic and another medicine. Using both a diuretic and another medicine often works well because diuretics can enhance the effect of the other medicines and sometimes prevent the fluid retention that can occur.
Diuretics are recommended as the first line of treatment for high blood pressure. They are usually recommended as one of at least two medicines to control high blood pressure.
Diuretics are especially beneficial in African Americans, older adults, people who are overweight, and people who have heart failure.
Because diuretics may raise cholesterol, make diabetes worse, cause gout, and make some types of heart disease worse, they need to be used carefully.
Diuretics reduce the risk of heart disease, heart attack, and stroke by reducing blood pressure.
Side effects of diuretics include:
- Increased thirst.
- Increased urination for a few days after beginning the medicine (thiazide diuretics).
- Reduced levels of potassium, magnesium, and sodium in the blood. Very low levels of potassium can lead to serious irregular heartbeats (arrhythmias).
- Increased levels of uric acid (which may lead to gout), calcium, blood sugar (which may complicate control of diabetes), and cholesterol.
- Weakness.
- Erection problems (impotence).
- Excess fluid loss from the body (dehydration) and fainting at higher doses, especially in older adults.
- Dry mouth.
- Tooth decay (dental caries).
- Interaction with other medicines, such as nonsteroidal anti-inflammatory drugs (NSAIDs), certain cholesterol-lowering drugs (such as cholestyramine), and lithium, a medicine used to treat certain mental illnesses.
See Drug Reference for a full list of side effects. (Drug Reference is not available in all systems.)
Potassium pills may need to be taken with some diuretics. A diet high in potassium also may be needed. Potassium is found in citrus fruits, bananas, raisins, tomatoes, and other foods. See your doctor before starting potassium supplements or making changes in your diet.
If you are allergic to sulfa, tell your doctor, because some diuretics contain sulfa. You can likely take a diuretic that does not contain sulfa.
These drugs are often inexpensive. But you may need regular blood tests while taking them, which could increase the cost of using them.
It is important to take high blood pressure medicines daily as prescribed. Because high blood pressure often has no symptoms, it is easy to forget to take the medicine.
If your high blood pressure medicine causes erection problems, you may want to talk to your doctor about erection-enhancing medicines such as sildenafil (Viagra).
Complete the new medication information form (PDF)(What is a PDF document?) to help you understand this medication.
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