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warnings
WARNINGS In severe impairment of renal function a test dose should be given (see DOSAGE AND ADMINISTRATION ). A second test dose may be given if there is an inadequate response. No more than two test doses should be attempted. Excessive loss of water and electrolytes may lead to serious imbalances. Serum sodium and potassium should be carefully monitored during mannitol therapy. The diuresis after rapid infusion of mannitol may increase preexisting hemoconcentration. With continued use of mannitol a loss of water in excess of electrolytes can cause hypernatremia. Shift of sodium-free intracellular fluid into the extracellular compartment after mannitol infusion may lower serum sodium concentration and aggravate preexisting hyponatremia. Closely monitor the urine output and discontinue mannitol infusion promptly if output is low. Inadequate urine output results in accumulation of mannitol, expansion of extracellular fluid volume and could result in water intoxication or congestive heart failure. Renal function must be closely monitored during mannitol infusion. Mannitol solution must be used with caution in patients with significant cardiopulmonary or renal dysfunction. Irrigating solutions used in transurethral prostatectomy have been shown to enter the systemic circulation in relatively large volumes, exert a systemic effect and may significantly alter cardiopulmonary and renal dynamics.