Magnesium supplements can cause gastrointestinal side effects like nausea, vomiting, diarrhea, and stomach pain. However, these side effects typically occur in doses larger than 350 milligrams. Very ...

Overview: Magnesium laxatives are used for occasional constipation. They work by pulling water into your intestines, which makes your poop softer and easier to pass. Diarrhea is a common side effect.