Mannitol Fresenius Kabi (Mannitol)

Mannitol is used as an osmotic diuretic to manage conditions involving elevated fluid pressure.

• Reduction of intracranial pressure: lowers pressure within the skull to prevent brain injury.
• Treatment of cerebral edema: reduces brain swelling caused by trauma or surgery.
• Promotion of diuresis in acute renal failure: increases urine output to aid kidney function.
• Reduction of intra‑ocular pressure: helps control pressure in glaucoma or ocular surgery.
• Renal protection during nephrotoxic procedures: safeguards kidney function during contrast imaging.

• Mannitol acts as an osmotically active agent that is filtered by the glomeruli but poorly reabsorbed in the renal tubules. The resulting osmotic gradient draws water into the tubular lumen, increasing urinary flow and reducing fluid volume in the extracellular space, which in turn lowers intracranial and intra‑ocular pressures and facilitates renal clearance of toxins.

Mannitol may cause a range of adverse reactions, from mild to severe.

Common Side Effects

• Headache: mild to moderate discomfort.
• Nausea or vomiting: gastrointestinal upset.
• Electrolyte imbalance: especially hyponatremia or hypokalemia.
• Hypotension: drop in blood pressure during rapid infusion.
• Tachycardia: increased heart rate.
• Thirst or dry mouth.

Serious or Rare Side Effects

• Pulmonary edema: fluid accumulation in the lungs.
• Severe electrolyte disturbances: hyperkalemia or hypernatremia.
• Anaphylactic reaction: rare allergic response.
• Acute renal failure worsening: especially in volume‑depleted patients.
• Hemolysis: breakdown of red blood cells.
• Metabolic acidosis: disturbance in blood pH.

Mannitol should be used with careful clinical monitoring to avoid complications.

• Monitor electrolytes: check serum sodium, potassium, and osmolality regularly.
• Assess renal function: evaluate creatinine and urine output before and during therapy.
• Use caution in heart failure: avoid fluid overload.
• Avoid rapid infusion in hypovolemia: infuse slowly to prevent hypotension.
• Contraindicated in severe dehydration: ensure adequate volume status.
• Store at 2‑8 °C: keep refrigerated, protect from light, do not freeze or shake.

Mannitol can interact with several drug classes, requiring attention to avoid adverse outcomes.

Major Interactions (Avoid)

• Loop diuretics: may cause profound electrolyte loss.
• ACE inhibitors or ARBs: increase risk of hypotension.
• Lithium: osmotic effect can raise lithium levels.
• Antihypertensives: additive blood pressure lowering.
• Other osmotic agents: excess osmolar load.

Moderate Interactions (Monitor Closely)

• NSAIDs: may reduce diuretic efficacy.
• Corticosteroids: can exacerbate fluid retention.
• Anticonvulsants: monitor for altered serum concentrations.
• Diabetic medications: watch for changes in glucose control.