Mannitol Viaflo Baxter (Mannitol)

Mannitol acts as an osmotic diuretic and is employed in several acute medical conditions.

• Intracranial hypertension: lowers intracranial pressure in patients with cerebral edema or trauma.
• Elevated intraocular pressure: reduces pressure in acute glaucoma or ocular surgery.
• Acute renal failure: promotes diuresis to facilitate fluid removal and improve renal output.
• Toxic renal excretion: enhances renal clearance of nephrotoxic substances such as certain contrast agents.

• Mannitol increases extracellular osmolarity by remaining largely confined to the vascular compartment. This osmotic gradient draws water from intracellular spaces into the bloodstream, expanding plasma volume and inducing diuresis. The resulting reduction in tissue water content lowers intracranial and intraocular pressure, while the increased urine flow assists in the elimination of renal toxins.

Mannitol may cause a range of adverse reactions, which vary in frequency and severity.

Common Side Effects

• Headache: mild to moderate discomfort often related to rapid osmotic shifts.
• Nausea or vomiting: gastrointestinal upset following infusion.
• Electrolyte imbalance: transient changes in serum sodium or potassium.
• Hypotension: drop in blood pressure due to plasma volume expansion.

Serious or Rare Side Effects

• Acute renal failure worsening: especially in patients with pre‑existing kidney disease.
• Pulmonary edema: fluid overload leading to respiratory compromise.
• Severe electrolyte disturbances: marked hypernatremia or hypokalemia.
• Anaphylactoid reaction: rare hypersensitivity presenting with rash, bronchospasm, or shock.

Mannitol requires careful clinical monitoring to minimise risks.

• Assess renal function: evaluate baseline creatinine and urine output before use.
• Monitor electrolytes: check serum sodium, potassium, and osmolality during therapy.
• Avoid rapid infusion: administer over the recommended time to reduce cardiovascular stress.
• Use cautiously in heart failure: risk of volume overload and pulmonary edema.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake.

Mannitol can interact with several drug classes, influencing safety and efficacy.

Major Interactions (Avoid)

• Loop diuretics: may cause severe electrolyte depletion.
• ACE inhibitors or ARBs: increased risk of hypotension and renal impairment.
• Nephrotoxic agents (e.g., aminoglycosides): heightened potential for kidney injury.

Moderate Interactions (Monitor Closely)

• Insulin: osmotic shifts can potentiate hypoglycaemia.
• Antiepileptic drugs: altered plasma concentrations may affect seizure control.
• Iodinated contrast media: combined renal stress may exacerbate nephropathy.