Some types of laxatives cause a staining of the bowel walls and some doctors believe overuse of these types can lead to colon cancer. There can be problems with heart rhythm due to loss of fluids and electrolytes in very severe cases (where someone is taking laxatives multiple times each day), and severe weight loss can occur as well. Regular use of some laxatives (Correctol, Ex-Lax, Feen-a-Mint) may interfere with your body's absorption of vitamin D and calcium; this can weaken the bones.
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