Clinical data | |
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Trade names | Hydrodiuril, others |
Other names | HCTZ, HCT |
AHFS/Drugs.com | Monograph |
MedlinePlus | a682571 |
License data | |
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Routes of administration | By mouth |
ATC code | |
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Pharmacokinetic data | |
Bioavailability | Variable (~70% on average) |
Metabolism | Not significant [3] |
Elimination half-life | 5.6–14.8 h |
Excretion | Primarily kidney (>95% as unchanged drug) |
Identifiers | |
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CAS Number | |
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UNII | |
KEGG | |
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ChEMBL | |
CompTox Dashboard (EPA) | |
ECHA InfoCard | 100.000.367 |
Chemical and physical data | |
Formula | C7H8ClN3O4S2 |
Molar mass | 297.73 g·mol−1 |
3D model (JSmol) | |
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Hydrochlorothiazide, sold under the brand name Hydrodiuril among others, is a diuretic medication used to treat hypertension and swelling due to fluid build-up. [4] Other uses include treating diabetes insipidus and renal tubular acidosis and to decrease the risk of kidney stones in those with a high calcium level in the urine. [4] Hydrochlorothiazide is taken by mouth and may be combined with other blood pressure medications as a single pill to increase effectiveness. [4] Hydrochlorothiazide is a thiazide medication which inhibits reabsorption of sodium and chloride ions from the distal convoluted tubules of the kidneys, causing a natriuresis. [4] [5] This initially increases urine volume and lowers blood volume. [6] It is believed to reduce peripheral vascular resistance. [6]
Potential side effects include poor kidney function, electrolyte imbalances, including low blood potassium, and, less commonly, low blood sodium, gout, high blood sugar, and feeling lightheaded with standing. [4]
Two companies, Merck & Co. and Ciba Specialty Chemicals, state they discovered the medication which became commercially available in 1959. [7] It is on the World Health Organization's List of Essential Medicines. [8] It is available as a generic drug [4] and is relatively affordable. [9] In 2022, it was the twelfth most commonly prescribed medication in the United States, with more than 38 million prescriptions. [10] [11]
Hydrochlorothiazide is used for the treatment of hypertension, congestive heart failure, symptomatic edema, diabetes insipidus, renal tubular acidosis. [4] It is also used for the prevention of kidney stones in those who have high levels of calcium in their urine. [4]
Multiple studies suggest hydrochlorothiazide could be used as initial monotherapy in people with primary hypertension; however, the decision should be weighed against the consequence of long-term adverse metabolic abnormalities. [12] [13] Doses of hydrochlorothiazide of 50 mg or less over four years reduced mortality and development of cardiovascular diseases better than high-dose hydrochlorothiazide (50 mg or more) and beta-blockers. [5] A 2019 review supported equivalence between drug classes for initiating monotherapy in hypertension, although thiazide or thiazide-like diuretics showed better primary effectiveness and safety profiles than angiotensin-converting enzyme inhibitors and non-dihydropyridine calcium channel blockers. [12]
Low doses (50 mg or less) of hydrochlorothiazide as first‐line therapy for hypertension were found to reduce total mortality and cardiovascular disease events over a four-year study. [5] Hydrochlorothiazide appears be more effective than chlorthalidone in preventing heart attacks and strokes. [14] Hydrochlorothiazide is less potent but may be more effective than chlorthalidone in reducing blood pressure. [14] [15] More robust studies are required to confirm which drug is superior in reducing cardiovascular events. [16] Side effect profile for both drugs appear similar and are dose dependent. [14]
Hydrochlorothiazide is also sometimes used to prevent osteopenia and treat hypoparathyroidism, [17] hypercalciuria, Dent's disease, and Ménière's disease.
A low level of evidence, predominantly from observational studies, suggests that thiazide diuretics have a modest beneficial effect on bone mineral density and are associated with a decreased fracture risk when compared with people not taking thiazides. [18] [19] [20] Thiazides decrease mineral bone loss by promoting calcium retention in the kidney, and by directly stimulating osteoblast differentiation and bone mineral formation. [21]
The combination of fixed-dose preparation such as losartan/hydrochlorothiazide has added advantages of a more potent antihypertensive effect with additional antihypertensive efficacy at the dose of 100 mg/25 mg when compared to monotherapy. [22] [23]
Package inserts contain vague and inconsistent data surrounding the use of thiazide diuretics in patients with allergies to sulfa drugs, with little evidence to support these statements. [26] A retrospective cohort study conducted by Strom et al. concluded that there is an increased risk of an allergic reaction occurring in patients with a predisposition to allergic reactions in general rather than cross reactivity from structural components of the sulfonamide-based drug. [27] Prescribers should examine the evidence carefully and assess each patient individually, paying particular attention to their prior history of sulfonamide hypersensitivity rather than relying on drug monograph information. [28]
There is an increased risk of non-melanoma skin cancer. [29] In August 2020, the Australian Therapeutic Goods Administration required the Product Information (PI) and Consumer Medicine Information (CMI) for medicines containing hydrochlorothiazide to be updated to include details about an increased risk of non-melanoma skin cancer. [30] In August 2020, the U.S. Food and Drug Administration (FDA) updated the drug label about an increased risk of non-melanoma skin cancer (basal cell skin cancer or squamous cell skin cancer). [31]
Hydrochlorothiazide is available as a generic drug under a large number of brand names, including Apo-Hydro, Aquazide, BPZide, Dichlotride, Esidrex, Hydrochlorot, Hydrodiuril, HydroSaluric, Hypothiazid, Microzide, Oretic and many others.[ medical citation needed ]
To reduce pill burden and in order to reduce side effects, hydrochlorothiazide is often used in fixed-dose combinations with many other classes of antihypertensive drugs such as:
Use of hydrochlorothiazide is prohibited by the World Anti-Doping Agency for its ability to mask the use of performance-enhancing drugs. [34]
Antihypertensives are a class of drugs that are used to treat hypertension. Antihypertensive therapy seeks to prevent the complications of high blood pressure, such as stroke, heart failure, kidney failure and myocardial infarction. Evidence suggests that reduction of the blood pressure by 5 mmHg can decrease the risk of stroke by 34% and of ischaemic heart disease by 21%, and can reduce the likelihood of dementia, heart failure, and mortality from cardiovascular disease. There are many classes of antihypertensives, which lower blood pressure by different means. Among the most important and most widely used medications are thiazide diuretics, calcium channel blockers, ACE inhibitors, angiotensin II receptor antagonists (ARBs), and beta blockers.
Atenolol is a beta blocker medication primarily used to treat high blood pressure and heart-associated chest pain. Although used to treat high blood pressure, it does not seem to improve mortality in those with the condition. Other uses include the prevention of migraines and treatment of certain irregular heart beats. It is taken orally or by intravenous injection. It can also be used with other blood pressure medications.
Indapamide is a thiazide-like diuretic drug used in the treatment of hypertension, as well as decompensated heart failure. Combination preparations with perindopril are available. The thiazide-like diuretics reduce risk of major cardiovascular events and heart failure in hypertensive patients compared with hydrochlorothiazide with a comparable incidence of adverse events. Both thiazide diuretics and thiazide-like diuretics are effective in reducing risk of stroke. Both drug classes appear to have comparable rates of adverse effects as other antihypertensives such as angiotensin II receptor blockers and dihydropyridine calcium channel blockers and lesser prevalence of side-effects when compared to ACE-inhibitors and non-dihydropyridine calcium channel blockers.
Angiotensin II receptor blockers (ARBs), formally angiotensin II receptor type 1 (AT1) antagonists, also known as angiotensin receptor blockers, angiotensin II receptor antagonists, or AT1 receptor antagonists, are a group of pharmaceuticals that bind to and inhibit the angiotensin II receptor type 1 (AT1) and thereby block the arteriolar contraction and sodium retention effects of renin–angiotensin system.
Irbesartan, sold under the brand name Aprovel among others, is a medication used to treat high blood pressure, heart failure, and diabetic kidney disease. It is a reasonable initial treatment for high blood pressure. It is taken by mouth. Versions are available as the combination irbesartan/hydrochlorothiazide.
Loop diuretics are pharmacological agents that primarily inhibit the Na-K-Cl cotransporter located on the luminal membrane of cells along the thick ascending limb of the loop of Henle. They are often used for the treatment of hypertension and edema secondary to congestive heart failure, liver cirrhosis, or chronic kidney disease. While thiazide diuretics are more effective in patients with normal kidney function, loop diuretics are more effective in patients with impaired kidney function.
Amiloride, sold under the trade name Midamor among others, is a medication typically used with other medications to treat high blood pressure or swelling due to heart failure or cirrhosis of the liver. Amiloride is classified as a potassium-sparing diuretic. Amiloride is often used together with another diuretic, such as a thiazide or loop diuretic. It is taken by mouth. Onset of action is about two hours and it lasts for about a day.
Chlortalidone, also known as chlorthalidone, is a thiazide-like diuretic drug used to treat high blood pressure, swelling, diabetes insipidus, and renal tubular acidosis. Because chlortalidone is effective in most patients with high blood pressure, it is considered a preferred initial treatment. It is also used to prevent calcium-based kidney stones. It is taken by mouth. Effects generally begin within three hours and last for up to three days. Long-term treatment with chlortalidone is more effective than hydrochlorothiazide for prevention of heart attack or stroke.
Thiazide refers to both a class of sulfur-containing organic molecules and a class of diuretics based on the chemical structure of benzothiadiazine. The thiazide drug class was discovered and developed at Merck and Co. in the 1950s. The first approved drug of this class, chlorothiazide, was marketed under the trade name Diuril beginning in 1958. In most countries, thiazides are the least expensive antihypertensive drugs available.
Reserpine is a drug that is used for the treatment of high blood pressure, usually in combination with a thiazide diuretic or vasodilator. Large clinical trials have shown that combined treatment with reserpine plus a thiazide diuretic reduces mortality of people with hypertension. Although the use of reserpine as a solo drug has declined since it was first approved by the FDA in 1955, the combined use of reserpine and a thiazide diuretic or vasodilator is still recommended in patients who do not achieve adequate lowering of blood pressure with first-line drug treatment alone. The reserpine-hydrochlorothiazide combo pill was the 17th most commonly prescribed of the 43 combination antihypertensive pills available in 2012.
Triamterene is a potassium-sparing diuretic often used in combination with thiazide diuretics for the treatment of high blood pressure or swelling. The combination with hydrochlorothiazide, is known as hydrochlorothiazide/triamterene.
Losartan, sold under the brand name Cozaar among others, is a medication used to treat high blood pressure (hypertension). It is in the angiotensin receptor blocker (ARB) family of medication, and is considered protective of the kidneys. Besides hypertension, it is also used in diabetic kidney disease, heart failure, and left ventricular enlargement. It comes as a tablet that is taken by mouth. It may be used alone or in addition to other blood pressure medication. Up to six weeks may be required for the full effects to occur.
Valsartan, sold under the brand name Diovan among others, is a medication used to treat high blood pressure, heart failure, and diabetic kidney disease. It belongs to a class of medications referred to as angiotensin II receptor blockers (ARBs). It is a reasonable initial treatment for high blood pressure. It is taken by mouth.
Metolazone is a thiazide-like diuretic marketed under the brand names Zytanix, Metoz, Zaroxolyn, and Mykrox. It is primarily used to treat congestive heart failure and high blood pressure. Metolazone indirectly decreases the amount of water reabsorbed into the bloodstream by the kidney, so that blood volume decreases and urine volume increases. This lowers blood pressure and prevents excess fluid accumulation in heart failure. Metolazone is sometimes used together with loop diuretics such as furosemide or bumetanide, but these highly effective combinations can lead to dehydration and electrolyte abnormalities.
Perindopril is a medication used to treat high blood pressure, heart failure, or stable coronary artery disease.
Perindopril/indapamide is a combination medication which contains perindopril and indapamide both of which are used for the treatment of essential hypertension.
Valsartan/hydrochlorothiazide, sold under the brand name Diovan HCT among others, is a medication used to treat high blood pressure when valsartan is not sufficient. It is a combination of valsartan, an angiotensin receptor blocker with hydrochlorothiazide, a diuretic. It is taken by mouth.
A diuretic is any substance that promotes diuresis, the increased production of urine. This includes forced diuresis. A diuretic tablet is sometimes colloquially called a water tablet. There are several categories of diuretics. All diuretics increase the excretion of water from the body, through the kidneys. There exist several classes of diuretic, and each works in a distinct way. Alternatively, an antidiuretic, such as vasopressin, is an agent or drug which reduces the excretion of water in urine.
Hypertension is managed using lifestyle modification and antihypertensive medications. Hypertension is usually treated to achieve a blood pressure of below 140/90 mmHg to 160/100 mmHg. According to one 2003 review, reduction of the blood pressure by 5 mmHg can decrease the risk of stroke by 34% and of ischaemic heart disease by 21% and reduce the likelihood of dementia, heart failure, and mortality from cardiovascular disease.
Aliskiren/hydrochlorothiazide, sold under the brand name Tekturna HCT among others, is a fixed-dose combination medication for the treatment of hypertension. It contains aliskiren, a renin inhibitor, and hydrochlorothiazide, a diuretic. It is taken by mouth.
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