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Don't use senna for more than two weeks. Longer use can cause abnormal bowel function and might cause dependence on laxatives. Long-term use can also cause low electrolytes which can cause heart function disorders, muscle weakness, liver damage, and other adverse effects.
Do not take senna if:
Report Problems to the Food and Drug Administration
You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.