Mannitol Vioser (Mannitol)

Mannitol is used in renal and neuro‑ophthalmic conditions where fluid removal is required.

• Acute renal failure: enhances urine output to aid renal clearance.
• Intracranial pressure elevation: lowers intracranial pressure by drawing fluid from brain tissue.
• Glaucoma: decreases intraocular pressure by osmotic fluid shift.

• Mannitol creates an osmotic gradient in the renal tubules and extracellular space after intravenous administration. The high‑solute concentration draws water from cells and interstitial fluid into the tubular lumen, increasing urinary water excretion and reducing volume in the intracranial and intraocular compartments, thereby lowering pressure in those sites.

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 hyperkalemia.
• Thirst or dry mouth: due to osmotic shifts.
• Transient hypotension: mild blood pressure drop.
• Injection site irritation: redness or pain.

Serious or Rare Side Effects

• Pulmonary edema: fluid accumulation in lungs.
• Renal failure worsening: especially in patients with pre‑existing kidney disease.
• Severe electrolyte disturbances: leading to cardiac arrhythmias.
• Hemolysis: especially in patients with G6PD deficiency.
• Allergic reactions: rash, urticaria, or anaphylaxis.
• Metabolic acidosis: due to acid‑base shifts.

Mannitol requires careful monitoring and specific patient considerations.

• Renal function assessment: avoid in severe renal impairment.
• Cardiovascular status: monitor for fluid overload in heart failure.
• Electrolyte monitoring: check serum sodium, potassium, and osmolality.
• Pregnancy and lactation: use only if benefits outweigh risks, as safety is unknown.
• Concomitant diuretics: adjust dosing to prevent excessive fluid loss.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze.

Mannitol can modify the effects of several co‑administered agents.

Major Interactions (Avoid)

• Loop diuretics: may cause profound volume depletion.
• Lithium: increased risk of toxicity due to altered renal clearance.
• Antihypertensives: additive hypotensive effect.

Moderate Interactions (Monitor Closely)

• ACE inhibitors or ARBs: monitor renal function and electrolytes.
• NSAIDs: may blunt diuretic response.
• Insulin or oral hypoglycemics: watch for changes in glucose control due to fluid shifts.