The osmotic and intrinsic mechanisms of the pharmacological laxative action of oral high doses of magnesium sulphate. Importance of the release of digestive polypeptides and nitric oxide.
Level 5 - mechanism / opinion, no new human data
Narrative review of pharmacological mechanisms with no primary human trial data presented.
What was done
This paper is a narrative review examining the physiological and pharmacological mechanisms of high-dose oral magnesium salts (such as magnesium sulphate) as laxatives, focusing on luminal osmotic actions and secondary physiological mediators.
What was found
The abstract reports no quantitative data or numerical outcomes. It describes that poorly absorbed magnesium and sulphate ions exert an intraluminal osmotic gradient that retains water and increases stool fluidity. It also identifies possible contributing intrinsic mechanisms, including cholecystokinin release and constitutive nitric oxide synthase activation, while noting the risk of systemic absorption leading to toxicity with prolonged or excessive use.
Why it matters
It outlines the dual mechanical and neuroendocrine pathways through which oral magnesium acts as a laxative and highlights the clinical boundary between therapeutic utility and systemic toxicity.
Limits
The abstract provides no empirical data, sample size, or systematic search methodology, functioning purely as a qualitative mechanistic overview.
Cited by
- supports Unabsorbed oral magnesium causes gastrointestinal distress and diarrhea by drawing water into the intestinal lumen.