Docusate: clinical use

Prescribing considerations

• Exclude bowel obstruction or another organic cause when symptoms or history suggest it.
• Persistent laxative need or ongoing abdominal pain warrants review.
• Avoid prolonged or chronic use because colonic atony and hypokalaemia can occur.
• Check formulation-specific excipients, including sorbitol, parabens, sodium benzoate, aspartame and sunset yellow.
• Age suitability differs between adult oral products, paediatric liquid and Norgalax.

Contraindications and cautions

• Hypersensitivity to docusate sodium or formulation excipients.
• Abdominal pain, intestinal obstruction, nausea or vomiting are contraindications for selected oral products.
• Norgalax is contraindicated with haemorrhoids, anal fissures, rectal bleeding, rectocolitis, inflammatory bowel disease, intestinal obstruction or ileus.
• Some sorbitol-containing oral formulations must not be used in hereditary fructose intolerance; aspartame-containing liquids require consideration in phenylketonuria.

Monitoring

• Review response and investigate constipation that persists or worsens.
• Assess hydration and electrolytes with significant diarrhoea, excessive purgation or prolonged use.
• Monitor for delayed hypersensitivity reactions to parabens and formulation-specific local irritation.

Clinical pharmacology

Docusate sodium is an anionic surfactant and faecal-softening agent. It increases penetration of water and fats into stool. Some gastrointestinal absorption and biliary excretion have been reported. Rectal Norgalax acts locally and rapidly, although minimal systemic absorption cannot be excluded.

Formulation and product differences

• Norgalax is a glycerol-containing rectal micro-enema with indications and contraindications distinct from oral docusate.
• Adult oral liquids and capsules are licensed for constipation and, for selected products, use alongside abdominal radiology.
• The selected paediatric oral solution is intended for children and infants over six months; adult formulations are not interchangeable without checking product information.
• Oral liquids vary in excipients, including sorbitol, parabens, sodium benzoate and, in some products, aspartame.
• Dioctyl is a soft gelatin capsule containing sorbitol and sunset yellow.

Capsule

Route: Oral

Strengths: 100 mg

Oral solution

Route: Oral

Strengths: 12.5 mg/5 mL, 50 mg/5 mL