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Magnesium citrate is a magnesium salt used in dietary supplements and over-the-counter saline laxatives. Current oral laxative products commonly contain 1.745 g of magnesium citrate per fluid ounce. They are labeled for occasional constipation and usually produce a bowel movement within 30 minutes to six hours.
read more about magnesium citrate ...Magnesium citrate increases the amount of water retained in the intestines through an osmotic effect. This softens stool and promotes intestinal movement, helping relieve occasional constipation.
Magnesium citrate oral laxatives are used for occasional constipation in adults and children under age-specific product directions. People with kidney disease, abdominal pain, nausea, vomiting, or a persistent change in bowel habits require medical advice before use. Frequent or prolonged laxative use also requires medical evaluation.
For current magnesium citrate saline laxative containing 1.745 g per fluid ounce, adults and children age 12 and older take 6.5 to 10 fluid ounces, with a maximum of 10 fluid ounces in 24 hours. Children age 6 through 11 take 3 to 7 fluid ounces, while children age 2 through 5 take 2 to 3 fluid ounces. Each dose is taken with a full glass of liquid. Directions can differ for other formulations.
Magnesium citrate can cause diarrhea, abdominal cramping, dehydration, and electrolyte disturbances. Excessive magnesium accumulation can occur in patients with impaired kidney function. Rectal bleeding or failure to have a bowel movement after use requires medical evaluation. Current labels advise against prolonged use without medical supervision and direct separation from other oral medicines by at least two hours.
Magnesium citrate oral laxatives temporarily relieve occasional constipation.
Current laxative labeling states that a bowel movement usually occurs within 30 minutes to six hours.
For the current 1.745 g per fluid ounce product, adults and children age 12 and older do not exceed 10 fluid ounces in 24 hours.
Kidney disease increases the risk of magnesium accumulation, so medical advice is required before using magnesium citrate laxatives.
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Magnesium Citrate Dibasic. PubChem. https://pubchem.ncbi.nlm.nih.gov/compound/Magnesium-citrate-dibasic. Date Accessed October 13, 2026.
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