Magnesium citrate (sensu lato) is used medicinally as a saline laxative and to empty the bowel before major surgery or a colonoscopy.

Magnesium citrate works by attracting water through the tissues by a process known as osmosis.

Magnesium citrate solutions generally produce bowel movement in one-half to three hours.

[10] Potassium-magnesium citrate, as a supplement in pill form, is useful for the prevention of kidney stones.

[11] Magnesium citrate is generally not a harmful substance, but care should be taken by consulting a healthcare professional if any adverse health problems are suspected or experienced.

Extreme magnesium overdose can result in serious complications such as slow heartbeat, low blood pressure, nausea, drowsiness, etc.