docusate sodium

Stool softener laxative· Brands: Colace, Dulcoease, Docusol, DocuSoft, NorgalaxPOPR

Mechanism of action

Docusate sodium is an anionic surfactant that lowers the surface tension at the oil-water interface of the stool. This allows water and lipids to penetrate and mix into the faeces, softening the stool and making it easier to evacuate.

Pharmacokinetics

Docusate sodium is poorly absorbed from the gastrointestinal tract and acts locally. Its onset of action is typically 1 to 3 days. It is excreted mainly in the faeces, with minimal systemic absorption and negligible levels in the urine.

Indications & dosing

Constipation

Alternative regimen: 100 mg three times daily. Short-term use.

adult · PO: 100–200 mg once daily · Alternative regimen: 100 mg three times daily. Short-term use.

Constipation

For children aged 6 to 12 years. Younger children: consult paediatric dosing.

pediatric · PO: 50 mg twice daily · For children aged 6 to 12 years. Younger children: consult paediatric dosing.

Constipation

Dose adjusted based on response and tolerance.

elderly · PO: 100–200 mg once daily · Dose adjusted based on response and tolerance.

Prevention of straining in patients with conditions such as cardiovascular disease or post-surgical

To avoid straining during defecation. Duration follows clinical need.

adult · PO: 100–200 mg once daily · To avoid straining during defecation. Duration follows clinical need.

Contraindications & precautions

Intestinal obstruction · Docusate sodium is contraindicated in patients with intestinal obstruction or ileus due to risk of perforation.
Acute abdominal pain, nausea, or vomiting of unknown origin · Avoid use when these symptoms are present as they may indicate serious underlying pathology.
Hypersensitivity to docusate sodium or any excipients · Allergic reactions can occur; do not use in patients with known hypersensitivity.
Fecal impaction · Do not use in patients with fecal impaction; manual disimpaction may be required.
Use with caution in patients with abdominal pain, nausea, vomiting, or fever, as these may indicate an acute abdominal condition requiring investigation.
Ensure adequate fluid intake; docusate sodium is more effective with sufficient hydration and dehydration may exacerbate constipation.
Avoid prolonged use; long-term or excessive use may cause dependence or electrolyte imbalance.
Caution when administering oral solution to elderly or bedbound patients due to risk of aspiration, especially if combined with mineral oil.
Monitor for potential drug interactions; docusate may alter absorption of co-administered oral medications.
Use with caution in children and during pregnancy or breastfeeding, weighing benefits against risks.

Adverse effects

Abdominal cramps
Diarrhoea
Nausea
Throat irritation (with oral solutions)
Skin rash
Pruritus
Anaphylaxisserious

Monitoring, pregnancy & toxicity

Stool frequency · During treatment
Signs of diarrhoea or dehydration · During treatment
Electrolyte levels · With prolonged use or high doses
Pregnancy: Docusate sodium is generally regarded as safe during pregnancy; it is minimally absorbed and can be used for constipation when needed.
Toxicity: Diarrhoea · Stop the drug, ensure adequate fluid intake.
Toxicity: Abdominal cramps · Supportive care; monitor for dehydration.
Toxicity: Electrolyte imbalance · Monitor electrolytes and replace if necessary.

Clinical notes

Docusate sodium is used for the treatment of constipation, particularly when straining should be avoided (e.g. after surgery, cardiovascular conditions, or haemorrhoids). It is not a stimulant laxative and may take several days to work. Common side effects include abdominal cramps, nausea, and throat irritation with liquid formulations. It should not be used in cases of intestinal obstruction, acute abdominal pain, or faecal impaction.

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BNF; local formulary