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Published on: 2/10/2026
Magnesium can help relieve constipation after 65, but safety depends on the type and dose, your kidney function, and hydration; occasional low-dose use may be fine, while frequent or high-dose use increases risks like diarrhea, dehydration, and electrolyte problems. There are several factors to consider; see below to understand more. Important details below explain which forms are more likely to trigger a bowel movement, safer nonmagnesium options and dosing tips, and red flag symptoms such as blood in stool, severe pain, or weight loss that warrant medical advice.
Constipation becomes more common as we get older. Slower digestion, less physical activity, certain medications, and chronic health conditions can all play a role. Because of this, many adults over 65 turn to magnesium supplements for relief—often noticing what people casually call "magnesium poop," meaning a bowel movement triggered by magnesium.
But is magnesium poop safe for constipation relief after 65? The short answer is: sometimes yes, sometimes no. It depends on the type of magnesium, the dose, and a person's overall health. Below is a clear, balanced look at what older adults should know.
"Magnesium poop" isn't a medical term. It describes the laxative effect that some forms of magnesium have on the bowels.
Certain magnesium salts pull water into the intestines. This extra water:
The result is often a bowel movement within a few hours. For someone struggling with constipation, this can feel like quick relief.
Understanding the cause helps determine whether magnesium poop is appropriate.
Common reasons constipation increases with age include:
Because constipation in older adults can have multiple causes, treating it with a single supplement may not always be the best long-term solution.
Not all magnesium supplements work the same way. Some are much more likely to cause magnesium poop than others.
Magnesium citrate
Magnesium hydroxide (milk of magnesia)
These are usually better tolerated and less likely to trigger magnesium poop, making them more suitable for people taking magnesium for muscle cramps or sleep rather than constipation.
Magnesium poop can be safe for some adults over 65 if:
For short-term relief, magnesium can help soften stool and restart bowel movements.
Magnesium poop becomes risky when:
Older adults are more vulnerable to electrolyte imbalances. Too much magnesium can build up in the body, especially if the kidneys don't clear it efficiently.
While magnesium is a mineral the body needs, too much—especially from supplements—can cause problems.
These risks increase with chronic use or underlying kidney disease. This is why magnesium poop should never be treated as a harmless daily fix.
Constipation is usually mild, but sometimes it signals something more serious.
Speak to a doctor promptly if constipation comes with:
These symptoms should never be treated with magnesium alone.
Before relying on magnesium poop, many older adults benefit from basic, safer strategies.
These steps reduce constipation risk without stressing the digestive system.
If magnesium is used, safety matters.
Magnesium poop should be considered a short-term tool, not a routine solution.
If you're experiencing ongoing digestive issues and aren't sure what's causing them, a free Constipation symptom checker can help you better understand your symptoms and whether it's time to seek medical care. Understanding the root cause is especially important for adults over 65, where constipation can have multiple underlying factors.
Healthcare providers often suggest alternatives that are gentler and safer for long-term use:
Magnesium may still be part of the plan—but typically with clear limits.
Magnesium poop can provide constipation relief for some adults over 65, but it is not risk-free. Occasional use may be acceptable for otherwise healthy individuals with normal kidney function. Regular or high-dose use, however, can lead to dehydration, electrolyte problems, and other complications.
Constipation in older adults deserves thoughtful attention. If symptoms are ongoing, worsening, or associated with red flags, speak to a doctor. Some causes of constipation can be serious or even life-threatening if ignored.
Magnesium can help—but only when used wisely, carefully, and with medical guidance.
(References)
* Li Z, Ma Y, Wu H, et al. Magnesium-containing laxatives for chronic constipation in older adults: A systematic review and meta-analysis. J Clin Gastroenterol. 2023 Sep 1;57(8):796-805. doi: 10.1097/MCG.0000000000001886. Epub 2023 Aug 25. PMID: 37624958.
* Quigley EM, Brierley SM. Pharmacological Management of Chronic Constipation in Older Adults: A Narrative Review. Drugs Aging. 2022 Sep;39(9):679-693. doi: 10.1007/s40266-022-00947-6. Epub 2022 Aug 3. PMID: 35921226.
* Roesler M, Roesler C, Junker B, et al. Adverse events associated with laxatives in the elderly. Aging Clin Exp Res. 2021 Dec;33(12):3269-3277. doi: 10.1007/s40520-021-01962-z. Epub 2021 Oct 6. PMID: 34617300.
* Zhang J, Han B, Zhu R, et al. Magnesium oxide for chronic constipation: a systematic review and meta-analysis. BMC Complement Med Ther. 2021 Oct 5;21(1):249. doi: 10.1186/s12906-021-03417-1. PMID: 34610815; PMCID: PMC8492063.
* Sumi Y, Ichimura H, Shiraishi Y, et al. Hypermagnesemia in patients with chronic kidney disease taking magnesium oxide for constipation: An analysis of case reports. J Pharm Health Care Sci. 2019 Jul 19;5:16. doi: 10.1186/s40780-019-0145-8. PMID: 31338271; PMCID: PMC6642055.
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