A female asked:
how long before magnesium pills will work for constipation? i took 500mg this afternoon (6-7 hours ago) and no significant bowel movement so far.
1 doctor answer
Dr. Reid Holtzclaw-swan answered
24 years experience Internal Medicine
Several days: 500 mg is not a huge dose. I would recommend 500 mg twice daily with plenty of water until you start having regular bowel movements, then cut back on the magnesium while maintaining the water intake.
Answered on Jan 19, 2017
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