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Before taking magnesium citrate, tell your doctor if you have any other medical conditions, allergies, or if you take other medicines or other herbal/health supplements. Magnesium citrate may not be recommended in some situations.

Do not use magnesium citrate as a laxative if you have stomach (abdominal) pain, nausea, or vomiting, unless directed by a doctor. If you notice a sudden change in bowel habits that persists over a period of 2 weeks, consult your healthcare provider before using a laxative. Magnesium citrate should not be used for longer than one week, unless otherwise directed by your healthcare provider. Rectal bleeding or failure to have a bowel movement after use of a laxative may indicate a more serious condition; stop using magnesium citrate and contact your healthcare provider.