Who should not take mannitol?

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Don't take mannitol if you have long-term renal problems or if your kidneys have shut down and you can't urinate. It's not recommended for anyone with congested lungs congestive heart failure or who are extremely dehydrated. Don't take mannitol if you have cerebral bleeding. Because mannitol may harm an unborn child, your doctor will weigh the benefits with the risks.