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Does Magnesium Citrate Cause Cramping?

author image Jonae Fredericks
Jonae Fredericks started writing in 2007. She also has a background as a licensed cosmetologist and certified skin-care specialist. Jonae Fredericks is a certified paraeducator, presently working in the public education system.
Does Magnesium Citrate Cause Cramping?
Osmotic laxatives may cause cramps. Photo Credit: champja/iStock/Getty Images

Difficulty passing stool is an uncomfortable problem that may require a nudge from an over-the-counter laxative. Four types of OTC remedies are available – lubricants, stool softeners, stimulants and osmotic laxatives. According to the University of California, San Francisco, magnesium citrate is an effective osmotic that has the tendency to produce significant cramping.

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Magnesium citrate is an oral, non-absorbable, ionic saline laxative. Saline laxatives such as magnesium citrate linger in the colon. As the non-absorbable ions linger, they attract water to the colon and intestines. According to Arkansas Tech University, as the water builds, it increases osmotic pressure within the intestinal walls. This pressure has a stimulating effect on the colon, resulting in peristalsis. Peristalsis moves food through the digestive tract and bowels, sometimes causing cramping.

Stimulatory Effects

If you have constipation, stool is not moving smoothly through your bowels, which means that peristalsis is limited. According to the University of California, San Francisco, osmotic laxatives, such as magnesium citrate, increase bulk, resulting in distension and constriction as liquid waste moves through the intestines. This forced peristalsis continues as the waste empties into the rectum. Stimulating the muscles of the intestines and rectum in this manner may lead to gas, bloating, diarrhea, nausea and bowel cramping.


Magnesium citrate is a potent laxative, ideally used on an infrequent basis. The Virginia Commonwealth University Wellness Resource Center explains that magnesium citrate may cause severe diarrhea, which may lead to dehydration. Seek medical attention if you experience blood in your stool, unexplained weight loss or abdominal pain while using magnesium citrate to relieve constipation. Constipation that lasts longer than three weeks also warrants a physician’s evaluation. If your kidneys are impaired, it is best to avoid magnesium citrate all together.


Unlike magnesium citrate, some laxatives are safe for use every day. Fiber stool softeners, such as polycarbophil, methylcellulose, psyllium and oat bran, naturally form bulk within the bowels, making it easier to pass stool. Taken with 8 oz. of water, fiber stool softeners relieve constipation over a series of days instead of a few hours, which is the case with magnesium citrate. Fiber produces a slower onset of peristalsis, reducing the likelihood of bloating and cramping.

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