Docusate

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Docusate
Docusate2DCSD.svg
Docusate sodium
Clinical data
Trade names Colace, Ex-Lax Stool Softener, others
Other namesDioctyl sulfosuccinate
AHFS/Drugs.com Monograph
MedlinePlus a601113
License data
Pregnancy
category
  • AU:A
Routes of
administration 		By mouth, rectal
Drug class Stool softener
ATC code
Legal status
Legal status
Pharmacokinetic data
Onset of action 12 hrs to 5 days [1]
Duration of action 3 days [1]
Identifiers
  • 1,4-bis(2-ethylhexyloxy)-1,4-dioxobutane-2-sulfonic acid
CAS Number
PubChem CID
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
E number E480 (thickeners, ...) OOjs UI icon edit-ltr-progressive.svg
CompTox Dashboard (EPA)
ECHA InfoCard 100.008.553 OOjs UI icon edit-ltr-progressive.svg
Chemical and physical data
Formula C20H37O7S
Molar mass 421.57 g·mol−1
3D model (JSmol)
Density 1.1 g/cm3
Melting point 153 to 157 °C (307 to 315 °F) 173-179 °C
Solubility in water 1 in 70 parts mg/mL (20 °C)
  • CCCCC(CC)COC(=O)CC(C(=O)OCC(CC)CCCC)S(O)(=O)=O

  • as salt: [Na+].[O-]S(=O)(=O)C(C(=O)OCC(CC)CCCC)CC(=O)OCC(CC)CCCC
  • InChI=1S/C20H38O7S/c1-5-9-11-16(7-3)14-26-19(21)13-18(28(23,24)25)20(22)27-15-17(8-4)12-10-6-2/h16-18H,5-15H2,1-4H3,(H,23,24,25)
  • Key:HNSDLXPSAYFUHK-UHFFFAOYSA-N

  • as salt: InChI=1S/C20H38O7S.Na/c1-5-9-11-16(7-3)14-26-19(21)13-18(28(23,24)25)20(22)27-15-17(8-4)12-10-6-2;/h16-18H,5-15H2,1-4H3,(H,23,24,25);/q;+1/p-1
  • Key:APSBXTVYXVQYAB-UHFFFAOYSA-M

Docusate is the common chemical and pharmaceutical name of the anion bis(2-ethylhexyl) sulfosuccinate, also commonly called dioctyl sulfosuccinate (DOSS). [2] [3] [4]

Contents

Salts of this anion, especially docusate sodium, are widely used in medicine as laxatives and as stool softeners, by mouth or rectally. [1] Some studies claim that docusate is not more effective than a placebo for improving constipation. [5] [6] [7] [8] Other docusate salts with medical use include those of calcium and potassium. [9] [1] [2] Docusate salts are also used as food additives, emulsifiers, dispersants, and wetting agents, among other uses. [10]

It is on the World Health Organization's List of Essential Medicines. [11] In 2022, it was the 148th most commonly prescribed medication in the United States, with more than 3 million prescriptions. [12] [13] In 2022, the combination with senna was the 261st most commonly prescribed medication in the United States, with more than 1 million prescriptions. [12] [14]

History

Sodium docusate was patented in 1937 by Coleman R. Caryl and Alphons O. Jaeger for American Cyanamid, [3] which commercialized it for many years as a detergent under the brand name Aerosol OT.

Its use for the treatment of constipation was first proposed in 1955 by James L. Wilson and David G. Dickinson, [4] and quickly popularized under the name Doxinate. [15]

Medical use

Constipation

The main medical use of docusate sodium is to treat constipation, acting as a laxative and stool softener. In painful anorectal conditions such as hemorrhoid and anal fissures, it can help avoid pain caused by straining during bowel movements.

When administered by mouth, a bowel movement often occurs in 1 to 3 days, [1] while rectal use may be effective within 20 minutes. [16]

Sodium docusate is recommended as a stool softener for children. [1]

However, its effectiveness for constipation is poorly supported by evidence. [5] [6] Multiple studies have found docusate to be no more effective than a placebo for improving constipation. [5] [6] [7] [8] Others have found it to be less useful for the treatment of chronic constipation than psyllium. [8] [17] [18]

The medication may be given to people who are receiving opioid medication, although prolonged use may cause irritation of the gastrointestinal tract. [8] [18]

Other medical uses

Docusate sodium, when used with ear syringing, may help with earwax removal, particularly in the case of impaction. [19]

Sodium docusate is also used as a lubricant in the production of tablets and as an emulsifier in topical preparations and other suspensions. [20]

Precautions and contraindications

Docusate sodium is approved and recommended as safe during pregnancy and breastfeeding. [21] [22]

Docusate is not recommended in people with appendicitis, acute abdomen, or ileus. [18]

When taken by mouth it should be ingested with plenty of water.

Side effects

Side effects are uncommon and typically mild, [1] and may include stomach pain, abdominal cramps or diarrhea, [1] Efficacy decreases with long-term use, and may cause poor bowel function. [9]

Serious allergic reactions may occur with the drug. The most severe side effect of docusate, although very rare, is rectal bleeding. [23]

Interactions

Docusate might increase the resorption of other drugs, for example, dantron (1,8-dihydroxyanthraquinone). [18]

Mechanism of action

Docusate is an anionic surfactant, which works by reducing the surface tension of the stool, allowing more intestinal water and fat to combine with the stool. [24] [9] [25] This decreases the strain and discomfort associated with constipation. [24]

It does not stay in the gastrointestinal tract but is absorbed into the bloodstream and excreted via the gallbladder [18] after undergoing extensive metabolism.

The effect of docusate may not necessarily be all due to its surfactant properties. Perfusion studies suggest that docusate inhibits fluid absorption or stimulates secretion in the portion of the small intestine known as the jejunum.[ medical citation needed ]

Pharmaceutical brand names

In the U.S., docusate sodium for pharmaceutical use is available under multiple brand names: Aqualax, Calube, Colace, Colace Micro-Enema, Correctol Softgel Extra Gentle, DC-240, Dialose, Diocto, Dioctocal, Dioctosoftez, Dioctyn, Dionex, Doc-Q-Lace, Docu Soft, Docucal, Doculax, Docusoft S, DOK, DOS, Doss-Relief, DSS, Dulcolax - Stool Softener (not to be confused with another drug marketed under the Dulcolax brand, bisacodyl, which is a stimulant laxative), Ex-Lax Stool Softener, Fleet Sof-Lax, Genasoft, Kasof, Laxa-basic, Modane Soft, Octycine-100, Pedia-Lax, Preferred Plus Pharmacy Stool Softener, Regulax SS, Sulfalax Calcium, Sur-Q-Lax, Surfak Stool Softener, and Therevac-SB. Generic preparations are also available.

In the UK, dioctyl sodium sulfosuccinate is sold under the brand names Docusol (Typharm Ltd) and DulcoEase (Boehringer Ingelheim).

In Australia, dioctyl sodium sulfosuccinate is sold as Coloxyl and Coloxyl with senna.

In India, preparations include Laxatin by Alembic, Doslax by Raptakos Laboratories, Cellubril by AstraZeneca, and Laxicon by Stadmed.

Other uses

Dioctyl sodium sulfosuccinate is used as a surfactant in a wide range of applications, often under the name Aerosol-OT. [4] [26] It is unusual in that it can form microemulsions without the use of co-surfactants, and it has a rich variety of aqueous-phase behavior including multiple liquid crystalline phases. [27]

Food additive

Dioctyl sodium sulfosuccinate has been approved by the US FDA as a "generally recognized as safe" (GRAS) additive. [28] It is used in a variety of food products, as a surface active agent, stabilizer, thickener, wetting agent, processing aid, solubilizing agent, emulsifier, and dispersant. The highest amount found in food products is 0.5% by weight, which include pasteurized cheese spreads, cream cheeses and salad dressings. [29] The FDA also approved its use as a wetting agent or solubilizer for flavoring agents in carbonated and non-carbonated drinks at levels up to 10 parts per million. [28]

Microencapsulation

Sodium docusate is the most widely used surfactant in reverse micelle encapsulation studies. [30]

Non-medical brand names

As a surfactant, docusate sodium is or has been commercialized under many brand names, including DSS, Aerosol OT, Alphasol OT, Colace, Complemix, Coprol, Dioctylal, Dioctyl-Medo Forte, Diotilan, Diovac, Disonate, Doxinate, Doxol, Dulsivac, Molatoc, Molofac, Nevax, Norval, Regutol, Softili, Solusol, Sulfimel DOS, Vatsol OT, Velmol, and Waxsol [31]

Chemistry

Structure and properties

The structural formula of the docusate anion is R−O−C(=O)−CH(SO−3)−CH2−C(=O)−O−R, where R is the 2-ethylhexyl group H3C−(CH2)3−C(−CH2−CH3)H−CH2−. The conjugate acid can be described as the twofold carboxylate ester of sulfosuccinic acid with 2-ethylhexanol.

The compound is a white, wax-like, plastic solid, with an odor suggestive of octyl alcohol. It starts to decompose at about 220 °C. [31]

The solubility of dioctyl sodium sulfosuccinate in water is 14 g/L at 25 °C, increasing to 55 g/L at 70 °C. [31] Solubility is better in less polar solvents: 1:30 in ethanol, 1:1 in chloroform and diethylether, and practically unlimited in petroleum ether (25 °C). It also is highly soluble in glycerol, although this is a rather polar solvent. It is also highly soluble in xylene, oleic acid, acetone, diacetone alcohol, methanol, isopropanol, 2-butanol, methyl acetate, ethyl acetate, furfurol, and vegetable oils. [31]

The ester groups are easily cleaved under basic conditions, but are stable against acids. [18]

Synthesis

Sodium dioctyl sulfosuccinate can be obtained by treating dioctyl maleate with sodium bisulfite. The bisulfite anion adds to the double bond:

−CH=CH− + HSO−3→−CH(−SO−3)−CH2−

Toxicity

Ingestion may cause the side effects described above, such as diarrhea, intestinal bloating, and occasionally cramping pains. Dioctyl sodium sulfosuccinate is not known to be carcinogenic, mutagenic, or teratogenic. [32]

Marine species

Dioctyl sodium sulfosuccinate is of low toxicity for crustaceans such as the hermit crab Clibanarius erythropus and the shrimp Crangon crangon . Toxicity for molluscs varies widely, with 48-hour LD50 found between 5 mg/L for the common limpet and 100 mg/L for the common periwinkle. Various species of phytoplankton have an LD50 around 8 mg/L.

In a 2010 study, dioctyl sodium sulfosuccinate exhibited higher toxicity against bacteria ( Vibrio fischeri , Anabaena sp.) and algae ( Pseudokirchneriella subcapitata ) than did a number of fluorinated surfactants (PFOS, PFOA, or PFBS). Measuring bioluminescence inhibition of the bacteria and growth inhibition of the algae, the LD50 were in the range of 43–75 mg/L. Combinations of the fluorinated compounds with dioctyl sodium sulfosuccinate showed mid to highly synergistic effects in most settings, meaning that such combinations are significantly more toxic than the individual substances. [33]

Freshwater species

The substance is highly toxic for rainbow trout with a median lethal concentration (LC50) of 0.56 mg/L after 48 hours for the pure substance. It is only slightly to moderately toxic for rainbow trout fingerlings, and slightly toxic for harlequin rasboras (LC50 27 mg/L of a 60% formulation after 48 hours).

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<span class="mw-page-title-main">Surfactant</span> Substance that lowers the surface tension between a liquid and another material

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<span class="mw-page-title-main">Constipation</span> Infrequent or difficult bowel movements

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<span class="mw-page-title-main">Laxative</span> Agents that relax and loosen the bowels and stools

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<span class="mw-page-title-main">Polystyrene sulfonate</span> Drug class

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<span class="mw-page-title-main">Bisacodyl</span> Laxative

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<span class="mw-page-title-main">Lubiprostone</span> Medication used for constipation

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<span class="mw-page-title-main">Polycarbophil calcium</span> Pharmaceutical drug

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<span class="mw-page-title-main">Macrogol</span> Medication for constipation, classified as an osmotic laxative

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<span class="mw-page-title-main">Sodium sulfosuccinate esters</span>

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Bis(2-ethylhexyl) maleate is the chemical compound with the structural formula (H3C 3−CH −CH2−O−C −CH=)2, where the two carboxylate groups are mutually cis. It can be described as the double ester of maleic acid with the alcohol 2-ethylhexanol. It is commonly called dioctyl maleate (DOM), reflecting the older usage of "octane" to refer to any 8-carbon alkane, straight-chained or branched.

References

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