Docusate Sodium — NZ Medication Guide
📋 Reviewed by a Registered Pharmacist NZ — This information is for general educational purposes only and does not replace professional medical advice. Always consult your doctor or pharmacist before starting, stopping, or changing any medication.
What is Docusate Sodium?
Docusate sodium is a stool softener (faecal softener) laxative used to prevent and treat constipation. This medication is available over-the-counter; some formulations funded by Pharmac.
What is Docusate Sodium Used For?
Docusate sodium is used for prevention and treatment of constipation — particularly post-surgical constipation, constipation in elderly patients, and cases where straining must be avoided (e.g., after myocardial infarction, following anal surgery, haemorrhoids).
How Does Docusate Sodium Work?
Docusate is an anionic surfactant (detergent) that lowers the surface tension of the stool, allowing water and fats to penetrate the faecal mass — softening stools without stimulating bowel contractions. It is the gentlest laxative option available.
How to Take Docusate Sodium
Capsules: 100–200 mg once or twice daily with a full glass of water. Oral liquid: 50–300 mg/day in divided doses. Onset of action: 12–72 hours. For best results, ensure adequate fluid intake.
Common Side Effects of Docusate Sodium
- Diarrhoea (with excessive doses)
- Mild abdominal cramping
- Nausea (rare)
Serious Side Effects — Seek Medical Attention
Contact your doctor or call 111 immediately if you experience any of the following:
- Electrolyte disturbance (with excessive chronic use)
- May increase absorption of mineral oil (avoid concurrent use)
Drug Interactions
Docusate Sodium may interact with other medicines. Always inform your doctor and pharmacist of all medications you are taking. Key interactions include:
- Mineral oil (docusate increases absorption of mineral oil — potentially causing systemic toxicity — do not combine)
New Zealand Prescribing Information
Docusate sodium (Coloxyl® 50 mg, 120 mg capsules) is available OTC at NZ pharmacies. It is the gentlest laxative option and is commonly used in post-surgical settings and in elderly patients for whom stimulant laxatives are too harsh. For opioid-induced constipation, docusate alone is typically insufficient — a stimulant laxative (senna, bisacodyl) is needed.
Frequently Asked Questions
Is docusate as effective as other laxatives?
Docusate is a gentle stool softener that works by moistening and softening hard stools. It is not as potent as osmotic laxatives (lactulose, macrogol) or stimulant laxatives (senna, bisacodyl). It is best suited for mild constipation or prevention, particularly where straining must be avoided. For opioid-induced constipation, a stimulant laxative is more appropriate.
Can I use docusate long-term?
Short to medium-term use is generally safe. For chronic constipation requiring ongoing management, consult your GP or pharmacist about the most appropriate laxative regimen.
References & Further Information
The following New Zealand and international resources were used to inform this page. We encourage you to consult these authoritative sources for the most current information:
⚠️ Disclaimer: This page is for educational purposes only. It is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your doctor or a qualified health provider. In New Zealand, medication availability and funding may vary — check with Pharmac or your pharmacist for current information.
Reviewed by a Registered Pharmacist NZ