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Sodium Picosulfate: Effects, Dosage & Side Effects

Sodium picosulfate is a laxative used to treat constipation and to cleanse the bowel before medical procedures such as colonoscopy.

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Things worth knowing about "Sodium Picosulfate"

Sodium picosulfate is a laxative used to treat constipation and to cleanse the bowel before medical procedures such as colonoscopy.

What is Sodium Picosulfate?

Sodium picosulfate is a well-established active ingredient belonging to the class of laxatives. It is primarily used for the short-term treatment of constipation and for bowel cleansing prior to diagnostic or surgical procedures, such as a colonoscopy. The medication is available without a prescription in many countries and is one of the most widely used laxatives worldwide.

Indications

Sodium picosulfate is indicated for:

Acute and chronic constipation
Bowel preparation before colonoscopy, rectoscopy, or intestinal surgery
Supporting bowel movements in bedridden patients
Prevention of straining in patients with hemorrhoids or following rectal procedures

Mechanism of Action

Sodium picosulfate belongs to the class of stimulant laxatives. After oral administration, the active substance is converted by intestinal bacteria in the colon into its pharmacologically active form. This active metabolite directly stimulates the mucous membrane of the large intestine, increasing bowel motility (peristalsis). At the same time, sodium picosulfate inhibits the reabsorption of water and electrolytes from the intestinal wall, resulting in softer stools that are easier to pass.

Since the conversion to the active form takes place in the colon, the laxative effect typically begins after 6 to 12 hours. When taken in the evening, a bowel movement can therefore be expected the following morning.

Dosage and Administration

Sodium picosulfate is available as drops, tablets, or in combination with other substances as a powder for oral solution. The standard dosage for adults is:

Drops: 10-18 drops (approximately 5-9 mg) once daily, preferably in the evening
Tablets: 1 tablet (5 mg) once daily, in the evening

Reduced doses apply for children and should be determined by a healthcare professional. The medication should not be used for longer than 1-2 weeks without medical advice.

Side Effects

Like all medications, sodium picosulfate can cause side effects. Commonly reported side effects include:

Abdominal cramps and bloating
Diarrhea with excessive doses
Nausea

With prolonged use or overdose, the following may occur:

Electrolyte imbalances, particularly low potassium levels (hypokalemia)
Laxative dependence
Weakening of the intestinal muscles

Contraindications and Warnings

Sodium picosulfate should not be used in cases of:

Bowel obstruction (ileus) or suspected ileus
Acute inflammatory conditions of the gastrointestinal tract (e.g., appendicitis, Crohn's disease, acute ulcerative colitis)
Severe dehydration
Severe kidney impairment

During pregnancy and breastfeeding, sodium picosulfate should only be used after consultation with a healthcare provider, as the substance may pass into breast milk in small amounts.

Drug Interactions

Relevant interactions include:

Diuretics and corticosteroids: Increased risk of electrolyte disturbances
Antibiotics: May alter gut flora and reduce the conversion of sodium picosulfate into its active form
Cardiac glycosides (e.g., digoxin): Hypokalemia caused by sodium picosulfate may enhance the effects of cardiac glycosides

References

European Medicines Agency (EMA): Product monograph for sodium picosulfate, 2023.
Lacy BE et al. - Bowel Disorders. Gastroenterology. 2016;150(6):1393-1407. PubMed PMID: 27144627.
Müller-Lissner S, Kamm MA, Scarpignato C, Wald A - Myths and misconceptions about chronic constipation. Am J Gastroenterol. 2005;100(1):232-242.

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