Mannitol Fresenius Kabi (Mannitol)

Mannitol is employed as an osmotic agent in clinical situations that require rapid reduction of fluid pressure or enhancement of urine output.

• Reduction of intracranial pressure: lowers elevated pressure within the skull to protect brain tissue.
• Treatment of oliguric renal failure: increases urine volume in patients producing very little urine.
• Promotion of diuresis in acute kidney injury: facilitates fluid removal and improves renal perfusion during AKI.

• Mannitol increases extracellular osmolarity when administered intravenously, creating an osmotic gradient that draws water from intracellular and interstitial spaces into the vascular compartment. This shift expands plasma volume, enhances glomerular filtration, and promotes renal excretion of water and electrolytes, while also decreasing intracranial and intra‑ocular pressure through fluid redistribution.

Mannitol may cause a range of adverse reactions, from mild to severe, depending on patient condition and dosage.

Common Side Effects

• Headache: mild to moderate discomfort often reported during infusion.
• Nausea or vomiting: gastrointestinal upset occurring shortly after administration.
• Electrolyte imbalance: changes in serum sodium or potassium levels.
• Thirst or dry mouth: sensation of increased fluid loss.

Serious or Rare Side Effects

• Pulmonary edema: fluid accumulation in the lungs requiring urgent care.
• Severe dehydration: excessive fluid loss leading to hypotension.
• Anaphylactic reaction: rare allergic response with rash, bronchospasm, or shock.
• Worsening renal failure: further decline in kidney function in susceptible patients.

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.
• Avoid in severe dehydration: risk of exacerbating fluid deficits.
• Use cautiously in heart failure: may increase preload and worsen congestion.
• Adjust in electrolyte disorders: dose may need modification if imbalances exist.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake.

Mannitol can interact with several medications, influencing fluid balance and electrolyte status.

Major Interactions (Avoid)

• Loop diuretics: combined use may cause excessive diuresis and electrolyte loss.
• Insulin: osmotic shifts can affect glucose control, requiring dose adjustment.
• ACE inhibitors or ARBs: may potentiate renal effects and potassium changes.

Moderate Interactions (Monitor Closely)

• Antihypertensives: blood pressure may fall more than expected.
• Lithium: altered renal clearance can raise lithium levels.
• NSAIDs: may blunt diuretic response and affect renal perfusion.