Chlortalidone

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Chlortalidone
Chlortalidone.svg
Chlortalidone ball-and-stick 3F4X.png
Clinical data
Trade names Hygroton, Thalitone, others
AHFS/Drugs.com Monograph
MedlinePlus a682342
License data
Pregnancy
category
  • AU:C
Routes of
administration 		By mouth
Drug class Thiazide-like diuretic
ATC code
Legal status
Legal status
Pharmacokinetic data
Protein binding 75%
Elimination half-life 40 hours
Excretion Kidney
Identifiers
  • (RS)-2-Chloro-5-(1-hydroxy-3-oxo-2,3-dihydro-1H-isoindol-1-yl)benzene-1-sulfonamide
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard 100.000.930 OOjs UI icon edit-ltr-progressive.svg
Chemical and physical data
Formula C14H11ClN2O4S
Molar mass 338.76 g·mol−1
3D model (JSmol)
Chirality Racemic mixture
  • O=S(=O)(N)c1c(Cl)ccc(c1)C2(O)c3ccccc3C(=O)N2
  • InChI=1S/C14H11ClN2O4S/c15-11-6-5-8(7-12(11)22(16,20)21)14(19)10-4-2-1-3-9(10)13(18)17-14/h1-7,19H,(H,17,18)(H2,16,20,21) Yes check.svgY
  • Key:JIVPVXMEBJLZRO-UHFFFAOYSA-N Yes check.svgY
   (verify)

Chlortalidone, also known as chlorthalidone, is a thiazide-like diuretic drug [1] used to treat high blood pressure, swelling (such as occurs in heart failure, liver failure, and nephrotic syndrome), diabetes insipidus, and renal tubular acidosis. [2] [3] Because chlortalidone is effective in most patients with high blood pressure, it is considered a preferred initial treatment. [4] [2] It is also used to prevent calcium-based kidney stones. [2] It is taken by mouth. [2] Effects generally begin within three hours and last for up to three days. [2] Long-term treatment with chlortalidone is more effective than hydrochlorothiazide for prevention of heart attack or stroke. [5]

Contents

Common adverse effects include low blood potassium, low blood sodium, high blood sugar, dizziness, and erectile dysfunction. [2] [3] [6] Other adverse effects may include gout, low blood magnesium, high blood calcium, allergic reactions, and low blood pressure. [2] [3] [7] Some reviews have found chlortalidone and hydrochlorothiazide to have a similar risk of adverse effects, [8] [9] while other reviews have found chlortalidone to have a higher risk. [1] [10] While it may be used in pregnancy it is a less preferred option. [2] How it works is not completely clear but is believed to involve increasing the amount of sodium and water lost by the kidneys. [2]

Chlortalidone was patented in 1957 and came into medical use in 1960. [11] It is on the World Health Organization's List of Essential Medicines. [12] It is available as a generic medication. [3] In 2021, it was the 127th most commonly prescribed medication in the United States, with more than 4 million prescriptions. [13] [14]

Medical use

High blood pressure

Chlortalidone is considered a first-line medication for treatment of high blood pressure. [2] Some recommend chlortalidone over hydrochlorothiazide. [1] [15] A meta-analysis of randomized controlled trials found that chlortalidone is more effective than hydrochlorothiazide for lowering blood pressure, while the two drugs have similar toxicity. [16] [17] [1] [10]

Trials of chlortalidone for high blood pressure found that lower doses of chlortalidone (e.g., 12.5 mg daily in ALLHAT study) had maximal blood pressure lowering effect and that higher doses did not lower it more. Chlortalidone and other thiazide diuretics are effective for lowering high blood pressure in persons with chronic kidney disease, although the risk of adverse effects is higher. [18] [19] [20] [21]

Left ventricular hypertrophy

Chlortalidone is used to treat enlargement of the left ventricle of the heart; it works chiefly by lowering blood pressure, and thereby reducing systemic vascular resistance. There is evidence that chlortalidone is superior to hydrochlorothiazide for reducing the mass of the left ventricle of the heart in persons with enlargement of the left ventricle of the heart. [22] Chlortalidone is superior to angiotensin converting enzyme Inhibitors or angiotensin II receptor blockers for inducing regression of enlargement of the left ventricle, which is the main pumping chamber of the heart. [23]

Swelling

Chlortalidone reduces edema (swelling) by increasing urinary salt and water excretion, lowering intravascular hydrostatic pressure and thereby lowering transcapillary pressure (see Starling Equation). Edema may be caused by either increased hydrostatic pressure or reduced oncotic pressure in the blood vessels. Edema due to increased hydrostatic pressure may be a result of serious cardiopulmonary disease (which reduces glomerular perfusion in the kidney) or to kidney injury or disease (which may reduce glomerular excretion of salt and water by the kidney) or due to relatively benign conditions such as menstrual-related fluid retention, or as an adverse effect of dihydropyridine calcium channel blockers, which commonly cause swelling of the feet and lower legs. Edema due to decreased oncotic pressure may be a result of leaking of blood proteins through the glomeruli of an injured kidney [24] or a result of diminished synthesis of blood proteins by a damaged liver. Regardless of cause, chlortalidone may reduce the severity of edema by reducing intravascular volume and thereby reducing intravascular hydrostatic pressure. [25]

Bone fracture prevention

Chlortalidone decreases mineral bone loss by promoting calcium retention by the kidney, and by directly stimulating osteoblast differentiation and bone mineral formation. [26] A Cochrane review found tentative evidence that thiazide exposure was associated with a reduced risk of hip fracture. [27] A secondary analysis of data from the ALLHAT study found that chlortalidone reduced risk of hip and pelvis fracture. [28]

Kidney stone prevention

Chlortalidone reduces the amount of calcium excreted in urine, reducing the risk of calcium oxalate kidney stones. [29] In people who have had multiple episodes of calcium oxalate kidney stones, chlortalidone lowers the risk of having another episode of kidney stones. [30] Chlortalidone is more effective than hydrochlorothiazide for lowering urine calcium levels and is therefore probably more effective. [31]

Ménière's disease

Chlortalidone reduces the endolymph volume which reduces the hydrostatic pressure in the inner ear chambers; elevated endolymph pressure in the inner ear is thought to be the cause of Ménière's disease or ’Endolymphatic hydrops.’ Synthesis of evidence from multiple small, low-quality studies indicates that chlortalidone or other thiazide diuretics are effective for Ménière's Disease. [32]

Diabetes insipidus

Chlortalidone (or other thiazide medication) is a key component of treatment of nephrogenic diabetes insipidus. Nephrogenic diabetes insipidus occurs when the kidney is unable to concentrate urine because it has an inadequate response to vasopressin-dependent removal of free water from the renal tubular filtrate. By blocking sodium ion resorption in the distal convoluted tubule, chlortalidone induces an increase in excretion of sodium ion in urine (natriuresis). Giving chlortalidone while simultaneously restricting dietary sodium intake causes mild hypovolemia (low intravascular volume), which induces isotonic reabsorption of solute from the proximal renal tubule, reducing solute delivery in the renal collecting tubule and renal medullary collecting duct. This reduced delivery of solute to the collecting tubule and medullary collecting duct allows increased water resorption and higher concentration of urine, which leads to reversal of nephrogenic diabetes insipidus by a means that is independent of vasopressin. [33]

Adverse effects

Some reviews have found a similar risk as hydrochlorothiazide, [8] [9] while other reviews found a higher risk of side effects. [1] [10]

The frequency and severity of these adverse effects is much reduced when chlortalidone is used at lower doses (e.g., 12.5 mg per day).

Mechanism of action

Chlortalidone reduces reabsorption of sodium and chloride primarily through inhibition of the Na+/Cl− symporter in the apical membrane of distal convoluted tubule cells in the kidney. [44] Although chlortalidone is often referred to as a "thiazide-like" diuretic, it is unlike thiazide diuretics in that, in addition to its inhibition of the Na+/Cl− symporter, it also strongly inhibits multiple isoforms of carbonic anhydrase. [45] Some of chlortalidone's diuretic effect is also due to this inhibition of carbonic anhydrase in the proximal tubule. [46] Chronic exposure to chlortalidone decreases the glomerular filtration rate. Chlortalidone's diuretic effect is diminished in persons with kidney impairment. By increasing the delivery of sodium to the distal renal tubule, chlortalidone indirectly increases potassium excretion via the sodium-potassium exchange mechanism (i.e. apical ROMK/Na channels coupled with basolateral Na+/K ATPases). This can result in a low blood concentration of potassium and chloride as well as a mild metabolic alkalosis; however, the diuretic effect of chlortalidone is not affected by the acid-base balance of the person being treated.

There is uncertainty about the mechanism of the blood pressure-lowering effect that occurs during chronic exposure to chlortalidone. [47] Initially, diuretics lower blood pressure by decreasing cardiac output and reducing plasma and extracellular fluid volume. Eventually, cardiac output returns to normal, and plasma and extracellular fluid volume return to slightly less than normal, but a reduction in peripheral vascular resistance is maintained, thus resulting in an overall lower blood pressure. The reduction in intravascular volume induces an elevation in plasma renin activity and aldosterone secretion, further contributing to the potassium loss associated with thiazide diuretic therapy.

Pharmacokinetics

Chlortalidone is slowly absorbed from the gastrointestinal tract after oral ingestion. It has a long half-life and therefore a prolonged diuretic action, which results in continued diuretic effects despite a skipped dose. This prolonged action of chlortalidone despite missing doses may account for the higher efficacy of chlortalidone compared to the shorter half-life medication, hydrochlorothiazide. Chlortalidone is eliminated from the body mostly by the kidney, as unchanged drug. Thus, in persons with diminished kidney function, the clearance of chlortalidone is reduced and the elimination half-life is increased. [48]

As with other thiazide diuretics, chlortalidone crosses the placenta and is excreted in breast milk. [49] Chlortalidone may suppress lactation, and has been used for this indication. Due to its long half-life, chlortalidone may accumulate in newborns via breast milk, despite receiving only about 6% of the maternal weight-adjusted dose. [50]

Chemistry

Chlortalidone is in the sulfamoylbenzamide class. As it lacks the benzothiadiazine structure of the thiazide-type diuretics, it is called a thiazide-like diuretic. [51] Chlortalidone is freely soluble in dimethylacetamide (DMA), dimethylformamide (DMF), dimethylsulfoxide (DMSO), and methanol; it is also soluble in warm ethanol. [48]

Chlortalidone is the official name of the medication according to the (INN/BAN), which is the medication naming system coordinated by the World Health Organization. Chlorthalidone is the official name of the medication according to the (USAN), which is the medication naming system coordinated by the USAN Council, which is co-sponsored by the American Medical Association (AMA), the United States Pharmacopeial Convention (USP), and the American Pharmacists Association (APhA).

Society and culture

Chlortalidone is banned for some sports (including cricket) because it is a diuretic, and can be used to reduce body weight or to mask the concomitant use of performance-enhancing drugs. [52] Sports such as wrestling or boxing categorize athletes according to body weight; taking a diuretic such as chlortalidone may lower body weight, and thereby permit an athlete to compete in a lighter weight class, which would provide an advantage. Diuretics such as chlortalidone also reduce the urine concentration of concomitantly-taken performance-enhancing drugs or of their metabolites, thus making it more difficult to detect these drugs using urine testing. [53]

Related Research Articles

<span class="mw-page-title-main">Hydrochlorothiazide</span> Diuretic medication

Hydrochlorothiazide, sold under the brand name Hydrodiuril among others, is a diuretic medication used to treat hypertension and swelling due to fluid build-up. 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. Hydrochlorothiazide is taken by mouth and may be combined with other blood pressure medications as a single pill to increase effectiveness. Hydrochlorothiazide is a thiazide medication which inhibits reabsorption of sodium and chloride ions from the distal convoluted tubules of the kidneys, causing a natriuresis. This initially increases urine volume and lowers blood volume. It is believed to reduce peripheral vascular resistance.

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.

<span class="mw-page-title-main">Indapamide</span> Thiazide-like diuretic drug

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.

<span class="mw-page-title-main">Hyperkalemia</span> Medical condition with excess potassium

Hyperkalemia is an elevated level of potassium (K+) in the blood. Normal potassium levels are between 3.5 and 5.0 mmol/L (3.5 and 5.0 mEq/L) with levels above 5.5 mmol/L defined as hyperkalemia. Typically hyperkalemia does not cause symptoms. Occasionally when severe it can cause palpitations, muscle pain, muscle weakness, or numbness. Hyperkalemia can cause an abnormal heart rhythm which can result in cardiac arrest and death.

<span class="mw-page-title-main">Electrolyte imbalance</span> Medical condition

Electrolyte imbalance, or water-electrolyte imbalance, is an abnormality in the concentration of electrolytes in the body. Electrolytes play a vital role in maintaining homeostasis in the body. They help to regulate heart and neurological function, fluid balance, oxygen delivery, acid–base balance and much more. Electrolyte imbalances can develop by consuming too little or too much electrolyte as well as excreting too little or too much electrolyte. Examples of electrolytes include calcium, chloride, magnesium, phosphate, potassium, and sodium.

<span class="mw-page-title-main">Loop diuretic</span> Diuretics that act along the loop of Henle in the kidneys

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.

<span class="mw-page-title-main">Amiloride</span> Medication

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.

<span class="mw-page-title-main">Thiazide</span> Class of chemical compounds

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.

<span class="mw-page-title-main">Gitelman syndrome</span> Medical condition

Gitelman syndrome (GS) is an autosomal recessive kidney tubule disorder characterized by low blood levels of potassium and magnesium, decreased excretion of calcium in the urine, and elevated blood pH. It is the most frequent hereditary salt-losing tubulopathy. Gitelman syndrome is caused by disease-causing variants on both alleles of the SLC12A3 gene. The SLC12A3 gene encodes the thiazide-sensitive sodium-chloride cotransporter, which can be found in the distal convoluted tubule of the kidney.

<span class="mw-page-title-main">Potassium-sparing diuretic</span> Drugs that cause diuresis without causing potassium loss in the urine and leading to hyperkalemia

Potassium-sparing diuretics or antikaliuretics refer to drugs that cause diuresis without causing potassium loss in the urine. They are typically used as an adjunct in management of hypertension, cirrhosis, and congestive heart failure. The steroidal aldosterone antagonists can also be used for treatment of primary hyperaldosteronism. Spironolactone, a steroidal aldosterone antagonist, is also used in management of female hirsutism and acne from PCOS or other causes.

<span class="mw-page-title-main">Losartan</span> Blood pressure medication

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.

<span class="mw-page-title-main">Metabolic alkalosis</span> Medical condition

Metabolic alkalosis is a metabolic condition in which the pH of tissue is elevated beyond the normal range (7.35–7.45). This is the result of decreased hydrogen ion concentration, leading to increased bicarbonate, or alternatively a direct result of increased bicarbonate concentrations. The condition typically cannot last long if the kidneys are functioning properly.

<span class="mw-page-title-main">Metolazone</span> Chemical compound

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.

<span class="mw-page-title-main">Mineralocorticoid receptor antagonist</span> Drug class

A mineralocorticoid receptor antagonist or aldosterone antagonist, is a diuretic drug which antagonizes the action of aldosterone at mineralocorticoid receptors. This group of drugs is often used as adjunctive therapy, in combination with other drugs, for the management of chronic heart failure. Spironolactone, the first member of the class, is also used in the management of hyperaldosteronism and female hirsutism. Most antimineralocorticoids, including spironolactone, are steroidal spirolactones. Finerenone is a nonsteroidal antimineralocorticoid.

<span class="mw-page-title-main">Bartter syndrome</span> Medical condition

Bartter syndrome (BS) is a rare inherited disease characterised by a defect in the thick ascending limb of the loop of Henle, which results in low potassium levels (hypokalemia), increased blood pH (alkalosis), and normal to low blood pressure. There are two types of Bartter syndrome: neonatal and classic. A closely associated disorder, Gitelman syndrome, is milder than both subtypes of Bartter syndrome.

<span class="mw-page-title-main">Sodium-chloride symporter</span> Protein-coding gene in the species Homo sapiens

The sodium-chloride symporter (also known as Na+-Cl− cotransporter, NCC or NCCT, or as the thiazide-sensitive Na+-Cl− cotransporter or TSC) is a cotransporter in the kidney which has the function of reabsorbing sodium and chloride ions from the tubular fluid into the cells of the distal convoluted tubule of the nephron. It is a member of the SLC12 cotransporter family of electroneutral cation-coupled chloride cotransporters. In humans, it is encoded by the SLC12A3 gene (solute carrier family 12 member 3) located in 16q13.

<span class="mw-page-title-main">Dent's disease</span> Medical condition

Dent's disease is a rare X-linked recessive inherited condition that affects the proximal renal tubules of the kidney. It is one cause of Fanconi syndrome, and is characterized by tubular proteinuria, excess calcium in the urine, formation of calcium kidney stones, nephrocalcinosis, and chronic kidney failure.

<span class="mw-page-title-main">Valsartan/hydrochlorothiazide</span> Chemical compound

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.

<span class="mw-page-title-main">Diuretic</span> Substance that promotes the production of urine

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.

<span class="mw-page-title-main">Idiopathic hypercalcinuria</span>

Idiopathic hypercalcinuria (IH) is a condition including an excessive urinary calcium level with a normal blood calcium level resulting from no underlying cause. IH has become the most common cause of hypercalciuria and is the most serious metabolic risk factor for developing nephrolithiasis. IH can predispose individuals to osteopenia or osteoporosis, and affects the entire body. IH arises due to faulty calcium homeostasis, a closely monitored process, where slight deviations in calcium transport in the intestines, blood, and bone can lead to excessive calcium excretion, bone mineral density loss, or kidney stone formation. 50%-60% of nephrolithiasis patients suffer from IH and have 5%-15% lower bone density than those who do not.

References

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