How do water pills (diuretics) work to lower blood pressure?

Diuresis. They act on the tubular part of the microscopic nephron in the kidney which filters out water and prevents reabsorption of that water in various parts of the tubule. Then this return blood deprived of water again circulates through the skin releases a plasma and it is avid for water and sucks it back.
Removal of fluid. Simple answer is that by removing excess fluid, the blood pressure is lowered. Some diuretics also have effects on the blood vessel walls causing them to dilate. Imagine a baloon with a gallon of water in it. Then remove 1/2 the water. The pressure inside the baloon is less. That is an oversimplification, but not completely.

Related Questions

How can a water pill help lower blood pressure?

Hypertension. Diuretics lower pressure both by removing fluid from the body and decreasing vascular resistance. Read more...

How long should it take for a diuretic to lower blood pressure?

Few days. It usually takes several days to see a consistent effect on your blood pressure. Most diuretics lower the blood pressure by 6-10 mmhg. Read more...

How long will it take for a diuretic to lower high blood pressure?

Diuretic . Generally, diuretic drugs such as hydrochlorothiazide take about 2 hours to produce diuresis (increased urine production) and roughly 1-2 days to lower BP. But this number really depends on quite a few factors (such as drug, dose, etc) and is more of an average response than an absolute rule. Hope that helps! Read more...
Time diuretic effect. In general a diuretic will lower the BP within 2 weeks if your BP is diuretic responsive. This will depend on how much salt you eat as well. I recommend trying the DASH eating plan see check list to test if your BP is diet sensitive first.Takes only 2 weeks but check with your team or consult me for more details. Read more...

Why would a water pill effect high blood pressure?

Hypertension. Diuretics lower pressure both by removing fluid from the body and decreasing vascular resistance. Read more...
Decreased pressure. Look at it this way: if you pee out more fluid, there is less water floating around in your blood vessels. Less water in the pipes means less pressure -- the same as water in your house coming out the faucet... Read more...

Do all high blood pressure pills have a water pill inside of them?

No. It is common to start people out on a water pill (also called a diuretic) or a pill that includes a diuretic medication in addition to another medication. But there are blood pressure pills that do not contain a diuretic. Read more...

Why can I not take any high blood pressure medication without a diuretic?

You can. But the first prescribed medications in patients with Hypertension (and particularly if they are overweight or obese) is HCTZ, (hydrochlorothiazide) a very mild diuretic and a better anti hypertensive medicine. Read more...
You can. Talk with your doctor about medications called ACE inhibiotors or angiotensin receptor blockers. They are equally good at treating high blood pressure and are not in the diuretic class. Hope this helps! Read more...

Can you tell me if the diuretic hctz (hydrochlorothiazide) is safe for controlling high blood pressure?

HCTZ (hydrochlorothiazide) and BP. Hctz (hydrochlorothiazide) (h) can be used to treat hbp. It can cause some changes in your serum electrolytes with low sodium and potassium being a consequence of its use. Most people, as they age, need more than a diuretic to control their bp. If one has no edema, perhaps another class of drugs, ace-i or arb's, is a better choice as they provide more cardiac and renal protection than h. Speak to your doctor about this. Read more...